Where are you getting 175kW for a Model 3? A standard model 3 uses 25 kWh per 100 miles according to [1]. If we assume it is traveling at 50 mph, that is 12.5kW continuous
Yes, I have misremembered the power, which seems to be 211 for most models. You are quite correct that it would make more sense to compare actual usage per distance, but I couldn't find this number for a train, so just compared the motors itself.