I don't see that happening. Train cars are incredibly simple things that have barely changed in many decades, probably because it's hard to introduce changes when all the cars need to be compatible with one another. Train cars don't even have electrical hook-ups, just air brake lines.
True for freight, but not true across for all rail. High speed rail in particular is usually a different gauge and has electric hookups for all cars, because every wheel needs to be driven to hit those speeds.
