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| Re: UP 4014 (1649074) | |||
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Re: UP 4014 |
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Posted by Jersey Mike on Tue Jun 16 16:13:00 2026, in response to Re: UP 4014, posted by Olog-hai on Tue Jun 16 01:25:19 2026. A locomotive working up hill is converting chemical energy into the potential energy of the train as it is raised in elevation. Every expansion of steam represents a quantity of this energy. Energy per unit time is power. Steam locomotives generate peak power at between 30% and 50% of their maximum speed as that is where the maximum amount of steam can flow from the boiler and perform useful work on the piston. #4014 has 7000hp vs the 5000hp of #2102, but that's a function of its having 4 cylinders and the ability to move more steam. Steam which makes a sound when it exits the stack and forces the exhaust itself higher into the air.Meanwhile steam locomotives hit peak tractive effort at 0 mph, a point at which they are generating little to no power. So sure, maybe #4014's 2000 extra HP allow it to tackle this grade with much less visible effort, or perhaps after multiple weeks on the road the diesels were giving it a bit of help. |
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