Amtrak Train Tickets across USA?

What is the definition of a segment?

Answer: One segment equals each boarding and disembarkation of a train or City to City pair. For example, Washington to Chicago with a connection in Pittsburgh would be considered 2 segments. Sleeping accommodations require an additional charge. Prices are valid all year with no Peak Pricing supplements.

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Eight segments is a long trip. A segment is a train trip from where you board to where you get off a single train. If you change to another train, that's another segment. So Washington DC to Seattle could be 2 segments (Cardinal from DC to Chicago, Empire Builder from Chicago to Seattle). Or is could be four (Northeast Corridor from DC to Boston, Lakeshore Limited from Boston to Chicago, California Zephyr from Chicago to Emeryville, Coast Starlight from Emeryville to Seattle).

Each segment has its own ticket, which can be used only once.