|/ /1840||Glengarnock Iron Company|
Opens an iron works at Glengarnock, Glengarnock Iron Works.
|/ /1884||Lanarkshire and Ayrshire Railway|
Authorisation given for extension from Ardrossan [CR] to Ardrossan [Montgomerie] Pier, use of the existing Ardrossan Harbour lines and an Ardeer branch. Glengarnock Iron Works and Kilbirnie [CR] branch authorised. Authorisation for the Irvine [CR] branch. Curve between the Irvine and Ardrossan branches authorised. Proposed link to the Glasgow and South Western Railway at Kilwinning abandoned.
|/ /1886||Lanarkshire and Ayrshire Railway|
Previous authorisation of a Glengarnock Iron Works branch abandoned and new line authorised. Authorisation for a curve between Irvine and Ardrossan branches abandoned.
This line is divided into a number of portions.