| / /1860 | Belfast, Holywood and Bangor Railway
Incorporated. |
| / /1865 | Belfast, Holywood and Bangor Railway
Opened from Holywood to Bangor. The Belfast Queen's Quay to Holywood portion of the Belfast and County Down Railway is transferred to the Belfast, Holywood and Bangor Railway. |
| / /1873 | Belfast, Holywood and Bangor Railway
Leased by the Belfast and County Down Railway. |
| / /1875 | Belfast, Holywood and Bangor Railway
Doubled from Belfast Queen's Quay to Holywood. |
| / /1876 | Belfast and County Down Railway
Lease of the Belfast, Holywood and Bangor Railway ends. |
| / /1884 | Belfast, Holywood and Bangor Railway
Absorbed by Belfast and County Down Railway. |
| / /1898 | Belfast, Holywood and Bangor Railway
Doubled from Bangor to Carnalea. |
| / /1899 | Belfast, Holywood and Bangor Railway
Doubled from Carnalea to Helen's Bay. |
| / /1900 | Belfast, Holywood and Bangor Railway
Doubled from Holywood to Craigavad. |
| / /1902 | Belfast, Holywood and Bangor Railway
Line fully doubled with the doubling from Craigavad to Helen's Bay. |
| / /1945 | Belfast, Holywood and Bangor Railway
Collision in fog at Ballymacarrett Junction results in 23 deaths. |
| / /1954 | Belfast, Holywood and Bangor Railway
All regular services become diesel. (First line in British Isles.) |
| / /1965 | Belfast, Holywood and Bangor Railway
Severed from the rest of the network with the closure of the Belfast Central Railway. |
| 10/04/1976 | Belfast, Holywood and Bangor Railway
Belfast Queen's Quay closes with the re-opening of the Belfast Central Railway. |
