That's the car. And, one of them is still in operation, and was going to be available for a reserved ride from DC to Pittsburgh this June, at least until Amtrak decided to stop allowing such things.
It doesn't show from the angle of that photograph, but the ribs do not go straight across the dome, but are sort of "swept-back", plus the angles on the end glass are different, making the dome look distinctive from the side. It also has a pretty distinctive profile from the end, with the center-most panels of the glass roof being flat and angled (instead of level like the Kato domes), and the side glass panels being curved.
That car and its sisters have a long history that might support a reasonable sized market, not just for the Capitol Limited. I hope somebody decides to produce one in N scale. I could actually use 2, because the B&O had 3, assigned 2 to the Capitol, and used the 3rd on the Shenandoah when it was not needed to fill in for an OOS dome in the Capitol service. So, one model -- 2 trains supported. Not to mention the other trains it has graced since the B&O's flag fell.
