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The middle tapper is used to demonstrate the "mode of signalling" by representing "BOX B" which is where the trainee is always positioned and "BOX A & B" are either side
These repeaters are quite scarce and seldom turn up for sale
An enamel British Railways Look out man`s arm band
This fine old British Railways Midland Region engineman`s oil feeder came from Bath Green park locomotive shed
RA 8705 RARE SPECIAL G.W.R. TYERS WOOD CASE SIGNAL ARM REPEATER ship-zone-d The middle tapper is usedThis very rare 1920s era G. W. R. Tyer`s wood case sign arm repeater was an experimental design which was most likely too expensive to produce , the white face is made from glass which was held in the brass frame as the images show. It could have been that electric lamps were to be fitted making it easier to view at night. We know of only one other example! This design is not in the Tyer`s instrument catalogue so they couldn't have produced many. This
