I have an MTH PRR G5s steam engine #5740 that has great whistle and chuffing sounds at high speed. I often run it up to 16 volts AC on my Z4000 transformer for a minute or two - probably about 70 mph - pulling 3 LIRR passenger cars - just as the real one did on the eastern end of Long Island. Nice sounds and whistle when the train is really moving...
MELGAR