Irish Railways LMSR Heppers Key Machine complete with brass ended steel key stamped on both sides 'LEVER No. 58'. Stands approximately 13 high and has a 2 diameter glass faced indicator at the top with a small lock and key beneath where it is embossed 'Patented No. 343035'. At the bottom where the Key Token fits, it is embossed ' LMSR Heppers Patent'. The top dome has a small plate attached 'The Westinghouse Brake & Saxby Signal Co. Ltd. London' Originated from Greenisland Signal Box on the Belfast to Larne line where it was in use from the 1930's right up until the 1980's. It was used to give an emergency release at Bleach Green Junction. The unit is fully functional and the small brass lock at the bottom is open allowing manual removal of the cover to release the key if operated.