Hornby 0 Gauge Boxed TCP (Terminal connecting plate) for Tinplate 3-rail Track, 6 volt

Hornby 0 Gauge Boxed TCP (Terminal connecting plate) for Tinplate 3-rail Track, 6 volt – Hornby 0 Gauge TCP (Terminal connecting plate) for Tinplate 3-rail Track, 6 volt  I am not sure that there are any differences between these are the 20 volt version as it was the trip wire that determined the cut off when the loco shorts on the track. One of these is over stamped from 4 volt as stated on the outer box – These are the standard connecting plates for electric 3-rail track. Excellent plus bright example. Priced each.