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The latest Classic Trains has an article of the Geep development with cutaway drawing of a GP9 which might help.
Rusty
Put me down for a phase 3, 48 incher, with brakes, hi nose, and all the toys! If lettered for N&W or the Penn, so much the better. They're Diesel-icious! !!!
Dave, I know nothing about the air plumbing on these locomotives, but in general inline filters were not very popular. There was the concern that a plugged up filter would cut off the air supply to the brake system. Graham White (Salem Line) does make a popular line of inline dryers. They are available in either single or twin tower designs. Normally there are two main reservoirs on a locomotive. The warm damp air from the compressors cools in the first reservoir, dropping much of its water and oil. That air then goes into the second reservoir where the air for the various air driven functions is tapped off. Where the dryer would be put would depend on the cooling done prior the air getting to the first reservoir and how much oil carry over there is.
The dryer is usually a speciality, specified by each railroad when purchasing a locomotive, or added after the locomotive was delivered. You might want to look at the Graham White web site. They use to have their catalog on line.
The dryer towers would be inline, probably either right after the air compressor or between the first and second reservoirs. They are probably located below the deck as they blow down the water and oil they have removed every time the compressor shuts down, which can make a mess.
Originally Posted by Ferroequus:
It is my understanding that one of the Main Reservoir tanks supplies air to the locomotive braking system, while the other supplies air for the horn, bell and toilet (if so equipped).
Sort of, yes. Locomotives (steam AND diesel) have two main reservoirs. The number one main reservoir is where most of the moister is dropped out of the compressed air as it cooled in the cooling pipe coils, thus all required auxiliary air usage is supplied off the number one reservoir, i.e. horns, bell, air compressor control, etc..
The number two main reservoir supplies the coolest/cleanest air to the air brake rack and brake stands. Any in-line air filters are usually part of the air brake rack under the cab floor.
