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I have a Proto SD7 for the Chessie Railroad that runs (Analog, no sound or DCC) but I find the 6 axle unit is too big for some of my kato switches.I will be replacing them with the new Proto 4 axle GP9's for the Chessie with DCC and Sound sometime in 2008. I run in the 50's as well as the modern times.I have F units and E units as well. The F is for manifest freight work and the E's are passenger only.GP's are the popular engines because the engineers hated switching in the F units. Leaning out of the window looking back was a difficult. The new GP's provided better support for humans who need to see everything and walk on everything.SD means special duty. It was given 6 axles so it can lightly go places where the track is not as strong.
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