I don't think they actually need to travel very far to be honest. Most of the work will be done in Tees Yard, and for any more major work, the loco's will be hauled off to Toton if they can't run under their own power.
One thing to remember though is the fact that the modern day loco's that EWS use aren't anywhere near as labour intensive as the older loco's used to be. They are also much more reliable.
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