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Interesting this. They do things very differently down the tube compared to how we do it in big trains. My only experience of driving sub-surface lines is on the Northern City Line. Here also it is assumed that the driver of the failed train won't be able to get back down the train to meet the 'assisting' driver at the assistance point, as we would on the mainline.
But it is expected that prior to coupling up and carrying out assistance, both drivers will be able to talk directly to each other by way of tunnel phones clipped onto the wires (as well as via the radio link to the signaller).
FP
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