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I think that the transplant at a subway station - a very tedious process. Why not createsuch a network in which each will operate its branch that is separate carriage is very small, and ground rings and lines. Imagine no no crowds, queues, stuffy stations. There is only your personal coach and its destination.
Sorry not very well translated. The idea is to create a network to each station waslinked to all others. Lest there be no queues no crowds on the trains. As a result, all will be satisfied. Here is a rough diagram.