The new trains will be 23 metres longer than the old ones. However, as a result of the extra length, the antiquated signalling system has to be modified and now it needs to be all tested out before it can be put in to use.
Apparently this is particularly crucial for the Edgware Road area as it's one of the busiest on the Tube network "the Spaghetti Junction of the Underground" and where the lines mentioned above meet.
TfL said "A replacement bus will be provided which will run from end to end along the closure route. This service will run every 10 minutes and will be monitored and supplemented if necessary." Find out more on TfL's site.
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