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<p>Various levels of automation currently operate across the underground network.
Automatically driven trains operate on the Central, Jubilee, Northern and Victoria
lines. On some lines, full automation may not be possible due to physical infrastructure
limitations.</p><p> </p><p>A decision to fully automate any Underground line, or the
entire network, would not be made solely on the net effect on the public purse, but
on the net effect of the costs and benefits. This would include consideration of financial
costs, but also the constraints of existing Underground physical infrastructure, customer
service and operational models.</p><p> </p><p> </p>
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