jis
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The current trend in the world seems to be to buy articulated train sets at least for short and medium distance corridor service, specially involving day trains. I can't see Amtrak going that route any time soon.
Many LD trains elsewhere are still individual cars hooked up together to form trains, and it is not unusual for them to be unmatched in color though often they are matched in car design, simply because of different operational characteristics of cars as in max speed, electrical compatibility, braking system compatibility etc. etc. In case of Amtrak those sorts of things are all standardized, so they can basically connect up whatever cars they have with appropriate types of accommodation into a train, except for the dichotomy between single level and bi-level.
Many LD trains elsewhere are still individual cars hooked up together to form trains, and it is not unusual for them to be unmatched in color though often they are matched in car design, simply because of different operational characteristics of cars as in max speed, electrical compatibility, braking system compatibility etc. etc. In case of Amtrak those sorts of things are all standardized, so they can basically connect up whatever cars they have with appropriate types of accommodation into a train, except for the dichotomy between single level and bi-level.