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Traction effort is a physical value, so it can only be attributed to actual mechanical parts of the locomotive. You can't calculate tractive effort for the generator output, because electricity is not a mechanical force (at least not on the marco level). Power on the other hand can be attributed to electricity. And usually the power used in calculations is prime mover power multiplied with efficiency of the entire locomotive (traction motor power loss included), so the figures of tractive effort are accurate if the right efficiency percentage is used. Starting tractive effort is calculated from locomotive weight and adhesion, while the continuous tractive effort is calculated from the maximum electrical flow that motors can tolerate (which gives you a certain minimum speed at full throtle). So, the motors can tolerate a certain amount of electricity, which means they have to turn at least so much while full generator output is being fed into them. That minimum turning speed gives minimum train rolling speed, which combined with HP and efficiency gives a certain maximum continuous tractive effort.
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