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I think diesel powered trains will still be in regular use for a long time yet. The lines for which electrification was recently announced are all either main lines or alternatives to existing electrified lines.
And even after this there are still plenty of them to go, before anyone considers moving onto the branch lines, and they will all be done before anyone considers electrification of the remote, underused and underfunded corners of the network.
And then after that you've got all the goods-only lines, yards and sidings, which probably won't be done until Peak Oil is a thing of the far distant past - probably some time towards the end of the 22nd century I would guess - if they are ever done at all.
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