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They'll build a new depot, but stock needs to be moved around all the time - on routes not necessarily related to the service route(s).
And to be fair, deviating from the Victorian loading gauge would necessitate a huge amount of Civil Engineering work to increase the size of all the tunnels and bridges. It's kind of locked in now.
No. If it's any bigger, it won't be possible to move it around the network for maintenance or other.