I know, they're been in service for a while now, but today is the first day I got to ride behind one on the Penn Line. Actually, I rode in front of it, as it was a southbound train being pushed. Seems like better acceleration than the old locos, and the car was rocking along at top speed in a manner reminiscent of being pulled by an electric. (We still have a couople of HHP8's in service). We diodn't get into Washington any earlier; there's some weird unexplained extended dwell time at Halethorpe and BWI, and today, the train stopped an proceeded slowly a bit between New Carrolton and the Anacostia River bridge.