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Wouldn't it be nice if a bus could pick up commuters close to their homes until it was full then transition from street to rail operations, couple to other busses while moving, and travel efficiently to dense urban or industrial stops?

I see articles about self driving cars and robots on Mars so it seems like there is technology to combine busses and existing rail lines.

There are railroad maintenance trucks that ride on either roads or rails. Computers can probably re-figure flexible schedules in seconds that once took a bunch of people and a printing press so they had to stay the same for years.

Off-rail service could make commuter service economical on many existing rail lines.