Could a Glasgow local explain why just building a modern subway/metro would be so difficult there? As much as I love the history and years of service of the subway,its an historical relic that unless rebored to take conventional/accessable stock is a non-starter.
The subway to be fully modernised soon with new trains and signalling. Platform to train interface is level I think but I don't know the extent of lift provision to street level.
If I understand it correctly, the main problem with the Sydney monorail was that it operated as a single loop in one direction only so a 'wrong way' trip took much longer than necessary. That design also made it harder to extend the system, much like it's proving difficult to extend the Glasgow subway.
The one possible 'easy' extension would be a westerly one via the Broomloan depot access ramps. A branch or network of branches to QE hospital, Renfrew and the airport might be possible alongside the Paisley lines and freight sidings branching therefrom, and trains could make a clockwise loop on the outer circle through the city centre without any track changes on the existing network at all. Heavy rail interchange would be available at Partick, Buchanan St / Queen St, St Enoch / Central and Cardonald.
The big question is could the extra trains and passengers be accommodated on the outer circle? I've no idea as to how close to maximum capacity the subway is.
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