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Another consideration is that the wiring for the Live Steam needs to be at least 1sq mm cross-sectional area to cope with the 6 to 7amps taken by the engines. This is considerably heavier that the cable used by most for wiring their layouts but is most important to avoid voltage drop to the further reaches of the layout with potential loss of control.
Such wiring will also happily cope with the much smaller currents taken by DC or DCC fitted locos.

I actually use relays under the baseboards to switch between the high-current busbars for the steamers and the traditional 12v DC controllers on the layout I've built - so I can run the different systems over the same sections of track.
See Mixing Hornby Live steam with 'Trad' 12v but note that at present the photos need to be updated!

Regards,
John Webb
 
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