The Signalling Record Society
ELR to RailRef Correlation - ELR Codes V
This page should be regarded as “Work in Progress”. The
In the Sykes’ Lock & Block system, there were usually three vertical iron rods linking each instrument on the block shelf with the lever frame below.
Signal Fact 21
These were referred to as rods S, Y and X in the manufacturer’s literature, spelling the company trade mark “SYX”.