RA 8181 BR-WR ALLOY SEALED RELEASE UNIT. booking this book is packed with

this book is packed with pictures of signalling across Britain's railway systems and is in  very good condition

An attractive polished L

This box has a lovely patina

there are some from welsh railways too all around the same date

these glasses often turn up at Railwayana fairs

RA 8181 BR-WR ALLOY SEALED RELEASE UNIT. booking this book is packed withThis BR WR Alloy sealed release unit used by the signalman to override a track circuit during a failure which was preventing the points from being moved, he would break the glass which allowed the button to be depressed to allow the lock to operate. This unit is complete with glass, new ticket and retaining spring clip.