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| Conrail Cadillacs:
The SD80MAC |
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For current locations of SD80MAC's, visit The
Railnut's Page
Conrail took major strides in becoming the industry leader through the purchase of 30 SD80MAC's, numbered 4100- 4129. To some in the railroad industry, the purchase is compared to the transition from steam to diesel powered locomotives. The new units not only provided Conrail with the highest available freight horsepower in North America for a time, but also introduced a new look for Big Blue. The most remarkable spotting feature of the new units will be the "White Smile" paint scheme. The idea behind the new scheme was not to liven the old blue scheme, but to serve a purpose! The "White Smile" was designed to make recognition of the new AC fleet quite easy for shop and maintenance personnel. The 'AC~Radial' logo below the cab number probably doesn't hurt either. The SD80MAC utilizes some of the most advanced technological breakthroughs in the railroad industry to put Conrail in a better position to make a run at the 21st Century. The 5000 horsepower 2 stroke 20 cylinder engine is the largest prime mover available in the railroad industry. Coupled with an air conditioned Whisper Cab TM, Integrated Cab Electronics, desk top controls, and the HTCR radial trucks, these units are the Cadillacs of the fleet.
AC TECHNOLOGY vs. DC
The most important advance of the SD80 is the AC traction motors. AC or alternating current motors have been around for many years, but were never able to match the starting torque of the DC or direct current traction motors. DC motors not only provided high starting torque, but brought many limitations. DC traction motors are equipped with commutators and carbon brushes which are subjected to very high current loads or Amps. A DC motor that would have high current loads while not in motion or while moving slowly, would receive major damage or burn-out if a high current would be applied for too long a period of time. At low speeds, the high amperage damage would occur within minutes. AC traction is favorable in that the motors are not equipped with the commutators and brushes, eliminating the limitations of the low speed high throttle position. The SD80MAC utilizes alternating current (AC) power that is derived from direct current (DC) power and the engine. The diesel engine drives the alternator and creates direct current power. The DC output or DC Link travels to inverters on the unit which convert the power back to AC, which is utilized to power the traction motors. The DC and AC sides of the circuit are decoupled by the inverter, meaning that both DC and AC components receive power supplied from opposite sides of the inverter. AC motors allow the SD80MAC's to have more pulling power, eliminates stall burns in the traction motors, and have very low maintenance requirements. DC traction motors require high current levels or amps, to produce high power. Heavy conductors and traction motor leads must be used to carry this high current and the high current levels produce a great deal of heat, further limiting the DC traction motor. The SD80MAC's traction motor relies on voltage and frequency to produce power more than current. This feature also eliminates the ammeter from the cab, replaced by a Tractive Effort Display. The AC motor will not allow dramatic wheel slip. The motor speed is controlled by the design of the motor and the frequency of the input voltage. Since the frequency is closely controlled by onboard computer systems, motors cannot run away as they would on a DC locomotive. All of the rest of Conrail's locomotives utilize DC power derived by the diesel engine, to power DC traction motors. The AC traction system, coupled with a very aggressive computer controlled wheel creep system, allow the 80MAC to achieve much higher adhesion levels than any other Conrail locomotive. The SD80MAC is now capable of 45% adhesion, versus the 27% achieved by the SD60 series. The SD80MAC is then capable of providing 185,000 pounds of starting tractive effort and because of the AC traction system design, longer periods of high throttle. Initial loading on the MAC's is slower than that of the DC counterparts, and locomotive roll back is possible. With DC units, the normal starting procedure would be to release the independent brake, then throttle up to move. The 80MAC's require the throttle to be advanced before releasing the independent brake. Starts on heavy grades require the throttle to be turned up and additional 1 or 2 notches from the DC counterparts. Sound and feel of the SD80MAC is very different from DC units. The aggressiveness of the wheel creep system may feel like the locomotive is experiencing run away wheel slip. Under normal DC conditions, the throttle would be increased, however on the MAC's, the throttle remains untouched unless a special 'wheel slip' light illuminates to the engineer. This will allow the unit to provide a very high adhesion and tractive effort at very low speeds.CONRAIL 80MAC FEATURES
WHISPER CAB TM
Conrail was the industry leader when the first production isolated cab was fitted on SD60I 5544 in 1994, and delivered as the last unit in the 5500-5544 order. The unit, as well as the SD80MAC's utilize the Whisper Cab TM to enhance crew safety and comfort. The SD60M and GE C40-8W classes made the first strides toward crew safety and comfort with more comfortable seating, desktop controls and reduced noise. Even with the regular wide cab units, the engine and the cab are mounted on the locomotive underframe, causing continued vibrations and moderate noise in the cab. Through the cooperative effort of EMD and Conrail, the Whisper Cab TM was born. The design of regular wide cabs, has the cab bolted to the underframe. With the Whisper Cab TM, the entire passenger compartment and about one foot of the hood ride on rubber pads or isolators. The rubber pads are mounted on shock absorbers, which allow the cab some freedom from the underframe and highly reduce both rough ride and noise in the isolated or "I" cabs. Rubber insulated slip joints are utilized at the front and rear of the cab to allow the movement on the shock absorbers. The cab noise speaks for itself as the 80MAC under load in throttle position 8 will provide the same noise and vibration level as a non-isolated cab at idle speed!
INTEGRATED CAB ELECTRONICS (ICE)
Demand in locomotive and train control devices have increased in the cab of the locomotives, necessitating the need to integrate systems. EMD and Rockwell teamed up to produce the Integrated Cab Electronics or ICE. ICE is a computer system that consolidates the functions of the speedometer, crew alerter system, end-of-train telemetry, and a multitude of other systems. Many of the SD60M's, and SD60I's already are equipped with ICE. The current ICE equipped units are sport Conrail Specific screens, meaning that the displays were designed to accommodate Conrail specifically. The SD80MAC uses the standard or universal MR screen format. This differs from the Conrail screen, providing a less cluttered appearance. The AAR screen differs from the Conrail screen in the following:- Cab signals are not displayed on the AAR screen but are on the older ICE systems
- Load meters are replaced by Tractive Effort Meters in the 80MAC's
- Both throttle position and tractive effort are displayed in the upper right portion of the screen
- Air brake information is available in the upper left of the screen
Major Dimension Comparisons |
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| Clearances | |||
| Length over coupler pulling faces | 80'2" | 71'2" | 71'2" |
| Width over hand rail support faces | 10'3 1/8" | 10'3 1/8" | 10'3 1/8" |
| Height, rail to top of cooling fan guards | 16'1" | 15'1 1/8" | 15'1 1/8" |
| Curve Negotiation (F-Type Coupler) | |||
| Single Unit | 27.4 Degree | 29 Degree | 29 Degree |
| Two Identical Units | 21.2 Degree | 24 Degree | 24 Degree |
| Unit coupled to a 50' Box Car | 15 Degree" | 16 Degree | 16 Degree |
| Gear Ratio | 83:16 | 70:17 | 70:17 |
| Capacities | |||
| Fuel | 5800 Gallons | 4400 Gallons | 4400 Gallons |
| Lube Oil | 510 Gallons | 436 Gallons | 395 Gallons |
| Cooling Water | 342 Gallons | 276 Gallons | 276 Gallons |
| Sand | 40 Cubic Feet | 56 Cubic Feet | 56 Cubic Feet |
| Air Compressor | Water Cooled
4 Cylinder Motor Driven |
Water Cooled
3 Cylinder Shaft Driven |
Water Cooled
3 Cylinder Shaft Driven |
| Pulling Power | |||
| Horsepower | 5000 | 3800 | 3500/3600 |
| Kilowatt Output | 3500 | 2862 | 2611 |
| Tractive Effort
Starting |
185,000 lb. | 100,000 lb. | |
| Tractive Effort
Continuous |
147,000 lb. | ||
HTC-RADIAL TRUCKS (HTCR)
Some will remember Conrail's test stint with the SD70M's and the EMD radial trucks on the Ellsworth Branch in Western Pennsylvania. The tests and data from the MR Test Center must have impressed Conrail enough to order all of the 80MAC's with the 6 axle radial trucks. The former HTC trucks on other 6 axle EMD units are rigid and cannot conform to rail curves. The flanges of the HTC bite into the gauge face of the rail, and wear metal from both the rail and wheel surfaces. The HTCR truck reduces the angle of attack, and literally steers through curves, keeping wheels parallel to the curvature of the rails. Tests by the Association of American Railroads show that curve performance of the HTCR truck is far superior to even two-axle trucks. Locomotive related rail wear in curves may be reduced by up to 66% with the HTCR vs. HTC truck. Conrail has also ordered the largest wheels available, in 45 inches! Former wheel sets were 40 inches, including the radial truck equipped Burlington Northern SD70MAC's. The larger wheels and the overall truck design improves weight distribution to the axles and allow better steering in curves, thus maximizing adhesion. Additionally, a flange lubricant system is housed within the trucks and is designed to reduce curve resistance, wheel flange wear, and rail wear. This series of truck, combined with the AC traction motors will create at least a 35% adhesion, a 10% jump from the DC HTC truck units. Cost savings will also become evident, as the current HTC trucks require overhaul at 500,000 miles, but the HTCR is designed to go 1 million miles between overhaul. The new HTCR trucks should:- Reduce operating and life-cycle costs
- Improve locomotive adhesion and performance
- Eliminate many conventional truck components
- Extend locomotive components and save track wear
- Improve ride quality
ELECTRIC PARKING BRAKE
Don't look for an external brake wheel anywhere on the Conrail SD80MAC's. The industry standard to date has been to place a brake wheel either on the firemen side short hood (non-wide cab units) or on the engineer side rear of the long hood. The SD80MAC is the introduction of EMD's new electrically applied/released parking brake. The device replaces the traditional hand brake mechanism in its entirety. The new device is activated from the cab's Engine Control Panel. A push-button activates a motor that drives a screw jack brake rigging on the conductor's side of the locomotive for the second and third axle. A meter on the panel indicates whether the brake is applied, released, or inactive. A back-up exists in the case of electronic failure, and requires hand cranking the screw jack from the conductor's side of the unit.ULTRA CAB II
The Harmon Ultra Cab II is similar to the Ultra Cab 1, in that it is a highly advanced microprocessor based Cab Signal and Train Control system. That is about where the similarities between UC I and UC II end. Under the ICE system, the LSL and Cab Signal test are integrated into one display. The Ultra Cab performs a combined LSL and Cab Signal self- test if the unit is in the "Non-Cab or Cab modes". A Cab Signal self-test will be initiated if me UC is in the "CS only mode". Harmon has integrated an internal speed generator into the UC II system, making testing for overspeed and overspeed penalty possible. This will speed shop testing this system, as no external speed source is necessary to verify the operation of the Ultra Cab. The new system is a modular system designed for high reliability and quick replacement, as well as the possibility for upgrade requirements. The system would allow the addition of multi-territory capabilities and advanced train control (ATC).ELECTRONIC FUEL INJECTION (EFI)
The electronic fuel injection or EFI is what makes these 20 cylinder monsters feasible for service into the 21st Century. The throttle commands are sent via the ICE to the EM2000 (the EMD computer system that controls the entire unit), where the signal is read and then sent to the interface board in the AC electronic cabinet. The electronic control module or ECM gets involved here and inputs the request from throttle to the engine sensors. The engine sensors measure multiple functions, such as fuel temperature, air pressure, and other features detrimental to providing the best fuel efficiency. The ECM takes those readings and energizes the EFI at the most appropriate time to receive the most efficient and cleanest burn possible. The mechanical energy needed to atomize the fuel is still generated by the cam shaft, however the timing and duration of the fuel injection are now electronically controlled.POWER PLANT
Conrail's SD80MAC's were the most powerful engines in revenue freight service in North America until the production of true SD90MAC-H's and AC6000CW's. The 80MAC's utilize a prime mover size that will be a "blast from the past" for some, 20 cylinders! Many will remember that the SD45 and SD45-2 series utilized a 20 cylinder power plant to generate 3600 horsepower. The SD45 and 45-2 had one disadvantage with the 20 cylinders which was their fuel efficiency. For that very reason, the SD45 fell into disfavor on Conrail and all were retired or sold and removed from the roster by 1989. Part of the SD45-2 fleet remains in service on Conrail, while some units are on lease and others have been sold. The remaining SD45-2's are shy of the 3600 horsepower that was once generated by 20 cylinders. The SD45-2's have received upgrades through the Juniata back shop, dropping the 20 cylinder power plant, replaced with 16 cylinders that are capable of generating 3000 horsepower. The SD45-2 was well liked by Conrail, as the Erie Lackawanna had ordered the units with 5000 gallon fuel tanks, making the units ideal for helper service over the Allegheny Mountains. The SD80MAC's utilize 20 cylinders, however are equipped with earlier mentioned electronic fuel injection (EFI) making them ideal for all types of service. The SD80MAC has a newly designed power plant, the 20- 710-G3B-ES. A break-down on the prime mover type: '20' is for the number of cylinders; '710' is the displacement of each cylinder measured in cubic inches; 'G' is the design of the crankcase; '3' is the designation for a turbocharged locomotive application; 'B' denotes improved fuel economy; 'E' for EFI; 'S' for split cooling. The new EMD 20 cylinder also utilizes a larger turbocharger, as the engine's oxygen requirements are higher than previous models. For comparison sake, Conrail's other 3rd generation EMD's, the SD50, SD60, SD60M, and SD60I, all use EMD's 16 cylinder prime movers. The SD50 uses a 16-645-F3B, which produces 3500 or 3600 horsepower. The SD60 series utilize a 16-710-G3 series, which generate 3800 horsepower.COOLING SYSTEM
Similar to recent General Electric locomotives, the SD80MAC uses a split cooling system with the engine coolant moved by two separate pumps. This differs from previous EMD's in that the coolant pumps are different sizes from each other. The two cooling circuits are normally independent of each other and supply cooling for (1) the power assembly and lube oil cooling; and (2) the air compressor and tubocharger intercoolers. These independent circuits usually use their own segment of the main radiators. Engine cooling takes precedence over combustion air cooling on the SD80MAC. The linking valve connects the two systems in the event of an imminent engine overheat condition. Due to the increased size of the radiators, the radiator hatch was designed in a "V-shape". The increased radiator size and split cooling give the SD80MAC the GE like flared radiator sections near the end of the long hood. The temperature control is regulated by the EM2000 computer, by governing air flow through the radiators with the use of shutters and fans. The temperature sensor communicates with the EM2000 and maintains engine coolant temperature at 160 to 170 degrees Fahrenheit in Throttle position 1 and idle and 175 to 185 degrees Fahrenheit in Throttle position 2 through 8. Engine performance is increased due to the new air system. The temperature of the incoming combustion air has a big effect on engine performance. On the SD80MAC the inlet air temperature is reduced, increasing engine performance through combustion or the charge air cooling system and four pass aftercoolers that recycle the water through the cooler before it's discharged to provide higher cooling capacity.OTHER CONRAIL FEATURES
Not that important in the EMD guide but a noise reduction feature was the relocation of the dynamic brakes to the rear of the unit. The 52" dynamic brake fan resides behind the split cooling radiators (flared section) and the trio of 48" cooling fans. The nose features the engineer side entry door, similar to the SD60I's but opposite the SD60M's. Above the cab mounted headlights and number boards are also Conrail specified options. The FRA mandated ditch lights are applied below the front anti- climber and on the front only. Horns are standard Leslie RSL-3L-R, placed just ahead of the flared radiators, centered on the long hood. The rear sand box is placed exteriorly on the rear-end porch. The cab roof is cluttered with 4 antennae, one large Sinclair antenna, and three small Sinclair antennae that provide radio communication, telemetry transmission and reception, as well as the distributed power transmission/reception.OPERATIONS
Conrail had generated an actual test plan that was never fully utilized, assigning multiple pairs of units to various aspects of service to find out which the units are best suited. The assignment summary was to be as follows; the Intermodal network receives 6 units, for service on TV9/TV14, TV1/Mail 8M, and TV3/Mail 44; the CORE Network receives 7 pairs for ELSE/SEEL, ELPI B/PIEL, ELIN/INEL, INSE/SEIN, COPI/PICO, PICC/CCPI, and PICA/CAPI; the Unit Train Operations receive 4 pairs, to be operated on UWZ, UNS, ULK A, and ULK C pools. The assignments were variable and the units often strayed from these assignments at the request of Philadelphia.Conrail had sent the 4100 and 4101 to Conway for the training of road foremen and other important Conrail employees. The 4102 and 4104 kicked-off service, breaking-in on PIAT/ATPI for three round trips. Upon completion of the mandated break-in, 4102 and 4104 were placed in unit train/mineral service, hauling coal loads from West Brownsville to Enola. The second trip even saw the pair operating all the way through to the York Haven PP&L power plant. Initial plans called for the West Brownsville-Enola pair to operate on ULK-A & C unit trains, however the pair had settled in on hauling coal for PP&L on the UFM/UFY series. On the fourth trip over the Alleghenies, 4102 and 4104 were given the honors of powering UFY-950, and 12,600 tons without the use of helpers. This was to be a test not looked highly upon by those involved. On the West Slope, approaching Lilly, PA, the pair gave it their best shot but were outdone by the 1 +% grade. HLP-21G was summoned from Altoona, and with a pair of SD40-2's, helped the UFY over the hill. Upon arrival at Enola that evening, both units were shopped and then placed in school and instruction service at Enola, PA. 4100 and 4101 were operated to Conway for training on a light engine move. Their first 'real' assignment was to haul PIAT-7 from Conway to Altoona on February 17. A quick return to Conway on ATPI-7, turned the power for PIMO-8 out of Conway, another train not shown on the initial test plan. After the 4100 and 4101 arrived Morrisville, PA in the wee hours of February 19, they were operated on a light engine move, ENS-101-19 to Oak Island. At Oak Island, the units were looked over by personnel and foremen, before being broken up and placed in TV-11/12 service (ed. -another pair of trains not listed in the test distribution plan). To date, the 4100 and 4101 have been handling the TV-11 and TV-12 trains as single units, occasionally passing in the night. 4105 and 4108 were released on Friday February 16 and operated in test helper service out of Cresson, PA. The pair began their ATPI/PIAT break-in runs on the ATPI-8X on Sunday February 18. The pair had continued in break-in service, with a glitch causing both units to be returned to Altoona for further work. After being released again from Altoona, both units returned to ATPI/PIAT service until March 1, when the worked east to Harrisburg on train PIBA-1X. The power was quickly turned and shipped further east on train HBAL-1B. After arriving at Allentown, the set made another quick turn, for train ALSE-3X. This move was to get the 4105 and 4108 to Selkirk for training and instruction. The 4106 was also released, and almost immediately placed into TV-11/TV-12 service, as the 4100 and 4101 began experiencing fuel injector problems. 4100 was pulled from service briefly, at Elkhart, where the injector problems were remedied. 4107 and 4103 also have been released and have been performing their obligatory PIAT/ATPI break-in runs. 4109,4110,4111, and 4112 have all been delivered to Altoona in their undecorated states, where Juniata will apply the "White Smiley" paint. 4103 and 4107 had been in test helper service between Altoona and Cresson, and were expected to be returned to the PIAT/ATPI service shortly. By late-March, the remainder of the units on-hand at Altoona should be in service. The remainder of this batch of 28 units should also be delivered before Spring.
Proposed Test Distribution Plan |
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Trains Assigned |
Between (Cities) |
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| INTERMODAL ASSIGNMENTS (6 Units) | |||
| TV14 / TV9 | Chicago, IL | Boston, MA | |
| Mail 8M / TV1 | Chicago, IL | Morrisville, PA | |
| Mail 44 / TV3 | E. St. Louis, IL | Kearny, NJ | |
| UNIT TRAIN ASSIGNMENTS (8 Units) | |||
| UWZ | Fola, WV | Ashtabula, OH | |
| UNS | West Brownsville | Somerset, NY | |
| ULK-A / ULK-C | West Brownsville | Baltimore, MD | |
| CORE NETWORK ASSIGNMENTS (14 Units) | |||
| ELSE / SEEL | Elkhart, IN | Selkirk, NY | |
| ELPI-B / PIEL | Elkhart, IN | Pittsburgh, PA | |
| ELIN / INEL | Elkhart, IN | Indianpolis, IN | |
| INSE / SEIN | Indianpolis, IN | Selkirk, NY | |
| COPI / PICO | Columbus, OH | Pittsburgh, PA | |
| PICA / CAPI | Pittsburgh, PA | Camden, NJ | |
| PICC / CCPI | Pittsburgh, PA | Oak Island, NJ | |
As more and more of the Big Macs arrived, Conrail strayed from their original plan. Certain trains, such as TV-11/12 and PICC were powered by SD80's quite often, while others like PICA were not. As the summer of 1996 began, most of the 4100's found their way to assignments on the Boston Line, replacing the venerable Dash 7's. A handful of SD80's remained on the Pittsburgh and Philadelphia divisions to handle coal and ore trains. On September 15, 1996, train ZWW-848 departed Philadelphia-Greenwich with three Locotrol-equipped C40-8W's on the point, and three more mid-train. This monsterous loaded ore train had 160 cars! This was the first of several Greenwich ore trains to have mid-train helpers, at least two of which were powered by four SD80MAC's pulling 200 cars! Throughout the summer, the 80MAC's could have been found in the Conway-Elkhart-Avon-Conway triangle, running on trains like PIEL and INPI. The MAC's have since found their way back to the central part of the system, and usually run on priority general freights or heavy coal drags.
CONRAIL AND THE FUTURE
Conrail was very pleased with the SD80MAC's, so much so that they purchased the only other SD80MAC's available, the General Motors Locomotive Group (GMLG) Demonstrators, 8000 and 8001. These units were cycled through Altoona, and emerged as Conrail 4128 and 4129. A large number of the SD80's continue to soldier-on over the Boston Line, where they will likely end their days for Conrail and begin a new life with CSX. Conrail had also placed a 1997 order for 30 more SD80MAC's (numbered 4130-4159), but those plans were squashed when CSX and Norfolk Southern fought for control of Conrail. With the acquisition of all of Conrail's stock, both roads technically owned Conrail and began making some decisions. It was decided that instead of getting more SD80MAC's, the 30-unit order would be split between NS and CSX. CSX was not conviced that the 5000 H.P. SD80MAC was what they needed. Apparently pleased with their recent acquisition of SD70MAC's, CSX opted to change their half of the order to SD70MAC's. These units will be constructed at Altoona, and emerge as Conrail 4130-4144, only to be renumbered and taken over by CSX upon completion of the acquisition. Norfolk Southern has not subscribed to the whole AC-technology program, and opted for standard (spartan cab) SD70's. These units will also be constructed at Altoona, but may emerge as NS-painted units. Initial plans had called for the units to emerge in full Conrail paint and numbered behind the highest SD60I's. Those plans recently changed, with the order now receiving road numbers 2557-2580, following NS's last order of SD70's. With NS not subscribing to AC-technology, SD80MAC's 4100-4129 will go to CSX after the acquisition.
Special thanks to J. Alex Lang for updating the operations of the
SD80MAC.
