I'm curious how specialized a railroad production line is. In automotive, it's fairly hard if not impossible to build materially different cars on one production line. It's so mechanized that the robots and fixtures are set up only around the hard points of one frame/body. Given that railcar assembly is much less mechanized, I bet the production line can support mutliple types of cars and its up to the supplier base to stamp out different pieces parts like bulkheads and interior parts.
Amtrak is proud to announce a new train to Florida that doesn't stink: The Floaterian. An all-star just like Babe Ruth.