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Hi

Please could someone explain the system of marker lights on BR diesel locomotives?

I have a Bachmann Class 08 (2 markers each end), Bachmann class 25 (2 markers each end 4 figure head code box) and BR derby light weight DMU (4 marker lights at each end) all in BR green livery.

I think they are a combination of red and yellow lights but which goes on the left/right etc with respect to the direction of travel?

Any help would be great

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[signalbox]

Will some express models kits be suitable for these locos?