|/ /1842||South Eastern Railway|
Opened from Reigate Junction to Tonbridge.
|/ /1842||London and Croydon Railway|
London and Brighton Railway and South Eastern Railway using route between Coulsdon and near London Bridge.
|/ /1843||South Eastern Railway|
Extended to Folkestone.
|/ /1844||South Eastern Railway|
Opened throughout to Dover.
|/ /1845||London and Greenwich Railway|
South Eastern Railway
Leased in perpetuity by the South Eastern Railway.
|/ /1846||Grand Leinster and Munster Railway
Wexford, Carlow and Dublin Junction Railway|
Merged to become Irish South Eastern Railway.
|24/07/1848||Irish South Eastern Railway|
Opened from Carlow to Bagenalstown.
|12/11/1850||Irish South Eastern Railway|
Extended from Bagenalstown to Kilkenny, the Wicklow and Kilkenny Railway laying an additional track alongside its route from Lavistown to Kilkenny.
|/ /1863||Irish South Eastern Railway|
Absorbed by the Great Southern and Western Railway.
|/ /1864||Bagenalstown and Wexford Railway|
With the supporting Irish South Eastern Railway being absorbed by the Great Southern and Western Railway, and the Dublin, Wicklow and Wexford Railway un-supportive, the line closes.
|01/04/1864||Mid Kent Railway (South Eastern Railway)|
Croydon (Addiscombe Road) opened.
|/ /1866||South Eastern Railway|
Sir Edward Watkin (of the Manchester, Sheffield and Lincolnshire Railway, later the Great Central Railway) becomes chairman.
|/ /1906||Wicklow Tramway Company|
Extended from Wicklow [1st] to quay. Worked by the Dublin and South Eastern Railway.
|01/01/1907||Dublin, Wicklow and Wexford Railway|
Renamed Dublin and South Eastern Railway.
|/ /1917||Dublin and Wicklow Railway|
Between 1917 and 1921 the Dublin and South Eastern Railway placed chained concrete block on the eastern side of the line for protection from the sea for 10 miles south from Greystones.
|/ /1925||Athenry and Tuam Extension to Claremorris Railway
Ballinascarthy and Timoleague Junction Light Railway
Ballinrobe and Claremorris Light Railway
Baltimore Extension Railway
Bantry Extension Railway
Cavan and Leitrim Railway
City of Dublin Junction Railways
Clonakilty Extension Railway
Cork and Macroom Direct Railway
Cork and Muskerry Light Railway
Cork, Blackrock and Passage Railway
Cork City Railways
Donoughmore Extension Railway
Dublin and Kingstown Railway
Dublin and South Eastern Railway
Great Southern Railway
Loughrea and Attymon Light Railway
New Ross and Waterford Extension Railway
Schull and Skibbereen Light Railway
South Clare Railways
Southern Railway [Ireland]
Timoleague and Courtmacsherry Light Railway
Timoleague and Courtmacsherry Extension Light Railway
Tralee and Dingle Light Railway
Tralee and Fenit Railway
Waterford and Tramore Railway
West Carbery Tramways and Light Railways
West Clare Railway|
Merged to become Great Southern Railways.
|01/04/1925||Mid Kent Railway (South Eastern Railway)|
Croydon (Addiscombe Road) renamed Croydon (Addiscombe).
|28/02/1926||Mid Kent Railway (South Eastern Railway)|
Croydon (Addiscombe) renamed Addiscombe (Croydon).
|13/06/1955||Mid Kent Railway (South Eastern Railway)|
Addiscombe (Croydon) renamed Addiscombe.
This line is divided into a number of portions.