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Being able to carry more people on the underground.
The platforms aren't long enough to take longer trains
The tunnels won't take wider trains
The signalling won't allow trains to run closer together
The lifts and escallators can't move people in or out of the station fast enough.

2006-12-04 11:51:11 · answer #1 · answered by Philip W 7 · 1 0

air conditioning on the tube

2006-12-04 19:33:22 · answer #2 · answered by cherub 5 · 0 1

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