offtop:
Now, I recall: we told about katenary's voltage.
Old locomotives spend much power for ventilation as well as on heat losses in rectifiers, inductive-shunt coils and traction motors themselves.
So, maybe, it has sense to specify such power wasting amount for particular locomotive (factor of useful action, taken from testing protocols)
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Is this to be understood as meaning that the current more or less well reflects the behavior of the DC series motor? Or do you just compare it?
I've meant:
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said work will cause whole ORTS adhesion physics revision, which will affect overall traction attitude
Though, You are right too: series DC motors are tend to overspeed, once wheel-pair, driven by them begin slipping.