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by jcranmer
2926 days ago
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> if the big cost of subways is wide-diameter tunnels, experimenting with narrow subways is worthwhile. It's not. The tunnels generally account for at best 1/3 the cost of a subway project, and even then, the cost of the tunnel that's variable per diameter is an even smaller fraction (since you're sticking a lot of other stuff in the tunnels). The big money sinks tend to be the underground stations. Overall, moving to a smaller diameter tunnel might save you around 10%, and you'd probably eat up much of those savings with rolling stock incompatibility issues. |
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