Radiator
The first run of BigBoys out of the Alco Locomotive Works were
equipped with air cooling piping that ran the length of the pilot
deck, supported on the top of the deck. This worked, but was inefficient.
Here, you can see the old radiator, or air cooling
piping, supported vertically on the pilot deck
Later on, Wilson After-Cooler radiators were placed behind
a grill low on the pilot deck. They were standard equipment on
the Union Pacific's Challenger 4-6-6-4 engines, and were adapted
for use on the BigBoys. They worked a lot more efficiently, cooling
a larger volume of air per given block of time.
Here, the new Wilson After-Cooler Radiator can be seen
behind the grill low on the pilot deck.
can be seen directly below the head light and
behind the number shield
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