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I read some engineering document that states a steam engine was a constant force machine up to a certain speed then moves into a constant hp machine whereas a diesel is a constant hp machine throughout its entire range. Long story short, even though both have the same horsepower and top speed but due to the engine characteristics, electric motors, and advantage of tractive forces of a diesel, it can out pull a steam engine on a grade. I was pretty shocked reading that.

[QUOTE="Riley P, post: 168088, member: 2"] I read some engineering document that states a steam engine was a constant force machine up to a certain speed then moves into a constant hp machine whereas a diesel is a constant hp machine throughout its entire range. Long story short, even though both have the same horsepower and top speed but due to the engine characteristics, electric motors, and advantage of tractive forces of a diesel, it can out pull a steam engine on a grade. I was pretty shocked reading that. [/QUOTE]

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