| 21/07/1840 | Glasgow, Paisley Kilmarnock and Ayr Railway
Howwood to Paisley opened. |
| 20/08/1840 | Glasgow, Paisley Kilmarnock and Ayr Railway
Glasgow to Ardrossan trains start running, with connections to Liverpool steamers. The Ardrossan Railway was re-built to standard gauge for its connection to the main line. |
| 04/04/1843 | Glasgow, Paisley Kilmarnock and Ayr Railway
Kilmarnock line from Dalry opened. |
| / /1846 | Kilmarnock and Troon Railway
Transferred to Glasgow, Paisley Kilmarnock and Ayr Railway. |
| 16/07/1846 | Kilmarnock and Troon Railway
Line leased to the Glasgow, Paisley Kilmarnock and Ayr Railway and re-gauged for locomotives. |
| 24/07/1847 | Paisley and Renfrew RailwayGlasgow, Paisley Kilmarnock and Ayr Railway
Paisley and Renfrew Railway absorbed by Glasgow, Paisley, Kilmarnock and Ayr Railway. |
| 01/07/1857 | Glasgow, Paisley Kilmarnock and Ayr RailwayAyr and Dalmellington Railway
Ayr Townhead becomes the main station in Ayr, Ayr [1st] is closed except for goods traffic. |
| 20/08/1883 | Lanarkshire and Ayrshire Railway
Act receives Royal assent as the Barrmill and Kilwinning Railway. The original proposal was a local line to link the Glasgow and Kilmarnock Joint Railway at Barrmill (joint G&SWR and CR) to the Glasgow, Paisley Kilmarnock and Ayr Railway at Kilwinning (G&SWR). |
| 06/04/1964 | Glasgow, Paisley Kilmarnock and Ayr RailwayArdrossan Railway
Irvine (Byrehill Junction) to Stevenston (Dubbs Junction) closed to passengers. Ardrossan to Kilmarnock service via Crosshill withdrawn. |
| / /1966 | Glasgow, Paisley Kilmarnock and Ayr Railway
Hurlford Shed (67B) closed. |
| 18/04/1966 | Glasgow, Paisley Kilmarnock and Ayr Railway
Dalry to Kilmarnock closed to local passenger trains. |
| /09/1967 | Glasgow, Paisley Kilmarnock and Ayr Railway
Ayr [1st] station and goods closed to freight. The railway level crossing (railway crossing railway) by the harbour closed. |
| 01/10/1973 | Glasgow, Paisley Kilmarnock and Ayr Railway
Dalry to Kilmarnock closed to all traffic. |
| 29/09/1986 | Glasgow, Paisley Kilmarnock and Ayr Railway
Electrification and re-signaling of Paisley to Ayr complete. |
