Gaugemaster GM491 Relay Boxes 4pcs (Pre-Built) – OO Gauge

Gaugemaster GM491 Relay Boxes 4pcs (Pre-Built) – OO Gauge

Manufacturer description

Relay boxes, also known as relay cabinets, were found alongside the railway tracks. They were used as part of the interlocking systems between track, points and signals and were generally found near station and yard areas.