Alan, you are correct MARC does operate Kawasaki Bi-Level Coaches, but they differ greatly from a "traditonal" bi-level coach. The Kawasaki coaches are built to have single level doors that are compatible with high level platforms. The cars are also equipped with power traps that all open automatically with the doors (based on what the Conductor asks the train to do). All MARC trains have doors that are compatible with both high and low level platforms (although the Kawasaki coaches are better suited for low level platforms than their Heritage counterparts). As far as train designation goes K Tower can tell who's train it is based on the symbol, AMTrak with numbers 0-299 and 2150-2299, MARC 400 and 800 series, and VRE 700 series (I could be wrong on VRE).