Like someone else said, inlines are for torque and V's are for HP. Now with a locomotive, they use a V style for horsepower to turn the main generator. Then it uses electrical energy to turn the traction motors in the trucks underneth it. So the electrical energy is what make the locomotive move and give it it tractive effort. But some older Baldwin, Fairbanks Morse, and I think Alco locomotives did use inlines in them for a powerplant.
__________________
Matt"Locomotive Superhero" 2002 Dodge Ram 2500 4x4 Reg. Cab, Arrest Me Red SLT Laramie 24v Cummins AT w/ 4.10 LSD. Quad XZT+, Gauges, Amsoil BHAF, Loud 4" Pipe, Tonneau Cover, Tinted windows. Thanks to South County Diesel Performance.