given that we 4mm scale modellers are quite content to use underscale trackwork, then perhaps it wouldn't be SO important what teh third rail was made of, or its height, as long as it gave roughly the right appearance?
as for pointwork.....third rail layout can be quite simple......complication in trackwork is un-necessary...we certainly seem to think so when buying our Peco points...even setrack!
I would suggest, if complicated pointwork is the name of the game, then the modeller concerned is quite likely to be making their own trackwork, therefore not the 'target' of my suggestions.
However, perhaps I have mislead folks.....I wasn't really considering any operational difficulties with 3rd rail.....just suggesting the idea that 3rd rail trackwork, easy-to-lay in the best peco streamline manner, might be a way of encouraging more folk to think ''Southern Electric''....thus improving sales of such as the 4-CEP-units...perhaps opening up a new area of modelling???
After all, as has been observed herein, there are few, if any, new DIESELS are left for Bachman or hornby or whoever to make?
plus, there IS a limit to the different types of DMU they might want to produce?
do not Southern electric sets cover a broader timespan than DMU's?
justa thought, that to open a new 'market', might need more than one nice model?
It might also need some nice 'infrastructure' to go with it?