Performance
Like the SD40-2 the GP40-2 has a reputation for reliability, and many are still in use. Changes such as the modular electronics system improved reliability over the GP40. Their high power-per-axle rating suited them to high-speed service rather than low-speed drag freights. The oldest GP40-2s are well over 30 years old, and many (notably GP40-2Ls) have been retired from Class-1 railroads and sold to regional or shortline railroads.
With the usual 62:15 gearing (65-70 mph maximum) EMD rated the GP40-2 at 55,400 lb continuous tractive effort; for compatability with other units most (all?) had the PF21 module that reduced horsepower below 23 mph, bringing the minimum continuous speed down to 11 mph.
Read more about this topic: EMD GP40-2
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