There is no timetable for when the engines, called the name Raven, will reach freight cars. The tips say the power supplies could come "relatively soon" with upgrades to improve the charging speed.
If the rumor is correct, it would be a logical step for Tesla. Longer range is a clear selling point, and can help Tesla deliver competing EVs from Audi and Mercedes as well. Faster charging, meanwhile, may be almost necessary if Tesla is to make the most of its third generation Superchargers. The bigger question is whether PMR will significantly affect the price. Although it is reasonable enough to sit in model 3, it has not been used in Tesla's most efficient cars to date.