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Tractive Effort, Horsepower and Slugs
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Oh my... <br /> <br />Power sets the rate of which work is performed. 2000 hp loco will need 1/2 of time to do the same job that 1000 hp loco would do. <br /> <br />Also - if we disregard adhesion limit - 2000 hp loco willl pull twice the tonnage of 1000 hp loco. <br /> <br />The problem lies in the fact that adhesion is limited - mostly by locomotive mass and efficency of wheel slip control systems. <br /> <br />So - gp38 (2000 hp) with 55000 lb of TE is at its adhesion limit. gp40 (3000 lb) could theoreticlly do 82500 lb TE, but adhesion will limit it to about 55000 lb... So pretty much 1000 hp is not used. <br /> <br />hence the idea of slugs - the "extra" 1000 hp at slow speed is sent to the slug thus increasing TE to 110000 lb.
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