Sound Transit operates LINK (what gp was talking about) and Sounder (not light rail, operates on BNSF tracks, coaches are made by Bombardier and seem to be in use by many commuter rail systems). Not sure what you're referring to.
That's LINK light rail, operated by Sound Transit. Here's an article about the (new) cars they use: https://www.soundtransit.org/blog/platform/new-link-light-ra... -- I get the impression all light rail cars in general are made to order per specifications, rather than off-the-shelf.
