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the starting tractive effort is affected by the stall torque of the torque converter, as well as gearing, wheel diameter and locomotive weight.

The relationship between power and tractive effort was expressed by Hay (1978) as

:

where
* t is tractive effort, in newtons (N)
* P is the power in watts (W)
* E is the efficiency, with a suggested value of 0.82 to account for losses between the motor

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