Because of delayed arrival for work today due to the ice storm, I was able to ride to work in daylight and see things out the window. As we passed the yard in Ivy City (just north of Union Station) I noticed some unusual looking double-deckers in MARC livery. A quick check in Wikipedia confirmed that they were part a an order of ~50 "multi-level coaches" from Bombardier that started delivery last June. Have these cars entered service? I've never seen them, and I'm pretty much a daily rider.