Looks like BART is trying out some new upholstery in their trains. The new material appears to be made of vinyl to it to help repel soiling, rather than the existing canvas seats.
I’m glad that BART is finally replacing their old worn upholstery. We’ll see how these seats hold up over time.
johnydecali 
Almost 40 years since my first ride on BART, and the seats still looked the same was quite a shock riding again this May! They don’t make upholstery like that anymore…