Bryan Smith posted:Those are Nitrous Oxide bottles (N2O) on top of the long hood.
Its design was to eliminate a helper engines on small to moderate grades.
The engineer has a small button on the throttle lever for the extra boost.<snicker>
You may be right, notice the rear (long hood) of the engine is higher than the front like drag racing cars.
P.S. is the fuel tank and water tank set up like a fuel tank and battery box on F units?