Per Wikipedia:
I can't vouch for accuracy.One of the five sets currently in service, the Mt. Adams set was originally built as a demonstrator and for potential service between Los Angeles, California and Las Vegas, Nevada. This was built with two additional standard coaches, for a total of 14 cars. It operated on the Seattle-Vancouver, B.C. run for several years in its original configuration. It was also originally painted in a different color scheme, using blue, black and silver instead of the green, brown and cream found on the other sets.
A six-car spare set, including a baggage car, service car, lounge-dining car, cafe car and two standard coaches, was also built. The two additional coaches from the fifth trainset and the two coaches from the spare set were placed in service on four of the other sets, resulting in four 13-car trains and one 12-car train.
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