I can understand the need to replace life-expired kit on the electric lines but just how much additional power resource is needed for the full Crossrail service? Apart from the ultimate use of all 10-car class 345s and a short section from the Bow portals, won't the frequency of trains and the load that they present be much the same as now?
Nearly twice the load. Longer and much, much more powerful. Add in all the new Anglia fleet, and a likely increase in electric freight, and it’s a serious lift in power required.