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Some parts of UK railways are 3rd rail DC (760 volts DC)... most of Southern and around Liverpool...modellers do model the "juice" rail... I've never seen parts advertised BUT if you can find someone modelling Southern on the Web they may be able to help. Models I've seen use something like code 83 for the running rails and code 50(ish) for the juice rail... they probably use some sort of beed to represent the insulating pots supporting the juice rail about every 5th tie. Don't recall what they did about the end run on and run off slopes. I'm assuming that you're asking because you want to model 3rd rail electrification rather than you have old 3rail models... hope so... 3 rail are only really collectables these days. If you think 3rd rail is awkward... try the London Underground... it's 4th rail... the centre 4th is not really a rail shape but almost square... which raises the point the outside 3rd is a rail shape but flat not round topped and the web is very short. Off cuts make very good little anvils for modelling. (Can't cut it with a hacksaw though)! Oh yeah, I've never known anyone use modelled outside 3rd to supply power to the trains... they stick with 2 rail... there would be serious issues with picking up from the 3rd rail via modelled shoes/shoe beams. Safety wise - full size - if any part of the collection gear on a train is in contact with live juice rail ALL the collection gear is live... this also means that if a single shoe bridges an isolation break it will juice up the isolated section from the live section.
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