Paul,
The car with the short dome is a K-Line as are all the 21" cars. The three 18" cars in one of the videos are MTH including the full dome. Club cars. I was too lazy to bring my El Cap set this time!
After running the E6s I'm tempted to order the GGD 37-46 Super Chief to go with it. A perfect pairing. It's just money right?
Don't know if this counts as West Coast also, but broke in this locomotive with the same cars Saturday too.