Mixed Engine Consists

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dave1905 said:
Engine accrue horsepower hours as long as the engine is in service (working order) whether its being used or not.

So in the example of the GP40's, as long as the engine is able to operate its paying back horsepower hours, whether its on a train or not, standing or moving. A GP40 will pay back hphrs just as fast as an SD40 because they are both 3000 hp.
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Engines only accrue horsepower hours when they are running. This is whether they are on a train or if they are idling. As long as the engine is online, it is accruing horsepower hours. That is why they are called horsepower hours; a measurement of horsepower generated over time. If the engine is off, it's not generating any horsepower.

A GP40 and SD40 will accrue horsepower hours differently because a railroad may have different uses for the engines. For example, an SD40 may generate more because it's operating more often at a higher throttle setting on main line trains generating more horsepower than a GP40 which would be sitting idle most of the time operating in branchline service.
 
I love that some of the examples given so far are of nose-to-nose consists. I'm not sure, but it seems that arrangement is as uncommon as mixed road name consists, and we're seeing both on the same train. Fun!
 


I try to compliment designs when possible.......but the styling of the amtrack P-42 loco......I mean something went really wrong there.

Mike
 


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