@Arthur P. Bloom posted:
The absolute power in kilowatts x 10^-n delivered to the drawbar seems to be an elusive answer, given the many variables: Voltage, track and wheel cleanliness, humidity, temperature, phase of the moon, mother's blood type, etc.
It’s not elusive at all. If you truly want “power” in the engineering textbook sense, just measure the pulling force over some distance and time. That’s all a horsepower is. I think it’s defined by lifting 33,600 lbs 1 foot in 1 minute or something.