[Piwoslaw]

Originally Posted by Piotrsko

The railroads don't own the railcars, except indirectly, just like containers. Unless there's a federal mandate for uniformity solar on rooftops aint gonna happen. Reefer's maybe if you point out significant cost savings over the install costs

Or... Railroads start charging proportionally to the cost of hauling a specific car.
It would take into account the weight of the car + cargo, its rolling resistance, possibly some measure of aero drag. Though I doubt the latter.

This scheme would favor lighter cars, with better serviced wheels and bearings.

Additional incentives for PV on the roof, to reduce the load on the engine.
Or with its own powered axles and batteries, regen and assist controlled from the loco.