Interesting thanks. A problem with this has been pointed out by David. Anot=
her is that you could only leave the train.=20
Coupling a coach on a running train would be very dangerous. With some very=
 sofisticated help from technology (or some late 18th century boldness :-))=
 it could surely be done, but it would need to be failproof and the space n=
eeded to do it would be great, increasing proportionally with the running t=
rain's speed. Surely undoable in cities or urban areas.


For fun, I recommend "The roads must roll" by Robert Heinlein

--=20
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