Early Telephone Circuit Card (GO 26.), ex Shotts Signal Box on the Caledonian Railway route out of Glasgow towards Edinburgh. There are 22 locations listed from Glasgow Central Freight Plant through Newton, Mossend, Uddingston, Bellshill, Fullwood, Holytown, Bellside, Benhar, Ravenscraig and Milnwood. In original glazed wooden frame, quite possibly Caledonian Railway but not marked.