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Underground-Symbol-Small.gif (1234 bytes)Tubeprune - The Tube Professionals' Rumour Network
Tubeprune is an unofficial web site for professional railway people working for London Underground and for those interested in the London Underground railway system.  To the Tubeprune Home Page


Photos - 1972 Tube Stock in Original Condition - Mixed

Fig. 1:  Mixed 1972 Tube Stock in the same train

72 TS I & II in train bw.jpg (42767 bytes)

Before 1984 it was not possible to use a Mk I unit and a Mk II unit of 1972 Stock in the same train.  However, in that year, some minor wiring modifications were carried out to allow this to happen.  This photo shows a mixed train at Edgware (Northern Line) with a 3-car Mk I unit (with unpainted doors) coupled to a 4-car Mk II unit (with painted doors).  The coupling point between the two units shows the UNDM of the 3-car unit coupled to the DM of the 4-car unit.  Photo by B Hardy.

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Fig. 2:  Mixed 1972 Tube Stock in the same unit

72 TS I & II in unit bw.jpg (44616 bytes)

Following the electrical modifications to allow Mk I units to couple to Mk II units, on at least one occasion, the two types appeared in the same unit.  In this instance a mixed unit was formed following collision damage to a couple of cars.   The Mk I motor car is coupled into a Mk II unit to replace a damaged DM car, while the photo illustrates clearly the differences in the bodyside logos.   Photo by B Hardy.

Since refurbishment, a number of trains have been formed with both types of cars.  They can only be distinguished by individual car numbers.

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