Amtrak also ran dome cars on the Capitol Limited. I was lucky enough to ride in many of these Amtrak dome cars.
Thanks so much for saying that - this has been something that's bothering my for years!!!!
In 1994 (I was 14), I took a train trip from Harper's Ferry to Raton to go to the Philmont Scout Ranch - it was the dream trip of a lifetime for a young kid like me. I vividly remember the train trip out there, and one of the things that I thought was the coolest was sitting in the front of the dome car and seeing the signals out in front of us change from green to red as the first part of the train passed by.
Fast forwarding to today, as I gained an interest in trains and started reading and learning, the fact that the CL was a superliner (and as was mentioned there are no superliner dome cars) really had me flummoxed. Knowing that dome cars once ran that route (I'm hoping as late as the summer of 1994???) makes everything make sense again!
As an aside, totally unrelated to domes, we went CL - SWC for the ride out, but went SWC and then CHI to PHL (and then south on the NEC to NCR) for the trip home. What train(s) were running that route then? Broadway Limited? Three Rivers? I remember (since we had a guaranteed connection) that Amtrak held the NEC train for us, as we were late getting into Philly. Once the train got in, they had us off first, and we all ran up a flight of stairs, across the station and then down a flight of stairs to get on the waiting train to head home. I was shocked and amazed that they would hold up the departure of a whole train, just for us!