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Look also at www.nbrasslocos.co.uk. Not used it myself but I will probably do so if I decide to electrify my layout. This gives a much wider variety of structures as would be seen on all but the simplest main lines. Some electric N gauge layouts omit the actual wires because it is impossible to model them at scale thickness and they are pretty much invisible at normal viewing distances. This would get round the problem of baseboard joins on portable layouts, make track cleaning slightly easier but mean that you have to find a way of fixing the pantograph to run just below the register arms, which unlike the prototype cannot be higher at level crossings or lower at overbridges.

Almost all freight terminals on the prototype are non-electrified, as most freight is diesel hauled. There would almost certainly be wiring on the main line crossovers, as these could be used for emergency single line working of electric trains. The entrance track to the terminal might also be wired for a short distance from the main line junction.

However the exceptions, which are electrified, tend to be the major intermodal terminals particularly those built for Channel Tunnel traffic. Obviously the wires don't go into the un/loading area but they can stop just short of the hard standing so the electric loco can push its train into position. If this isn't possible (it needs an electrified run-round loop somewhere else) then a diesel shunter can be used.
 
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