4QD Motor Speed Controller
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4QD Motor Speed Controller
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Double heading is a term used by loco builders - it is not of interest unless you are building a loco!
In double heading, you have an engine on each end of the locomotive, so each end is a 'head', hence double heading.
For double heading, you ideally need to drive both locos at the same speed from a common set of controls. The Pro and NCC series controllers have (optional) expansion connectors which can be used to interconnect them for double heading.
See also 'Double heading' a loco in our FAQ pages.
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