Tyer's No 9 Alloy Single Line Key Token CAIRNRYAN JCT - CASTLE KENNEDY No 8. Ex Glasgow & South Western Railway (Portpatrick & Wigtownshire Joint Railway ) east of Stranraer, inc the junction for the Cairnryan Military Rly. The section changed to Castle Kennedy - Stranraer Harbour Junction in 1962 when the Cairnryan Signalbox closed.