| /05/1839 | Stockton and Hartlepool Railway
Construction begins without Act. Line built to extend Clarence Railway to the better Victoria Dock [Hartlepool] of the Hartlepool Dock and Railway. Port Clarence was tidal. |
| 12/12/1840 | Stockton and Hartlepool Railway
Opened to freight. |
| / /1841 | Clarence Railway
Stockton and Hartlepool Railway given permission to build platform at Billingham. |
| 09/02/1841 | Stockton and Hartlepool Railway
Opened to passengers. |
| 26/03/1841 | Clarence Railway
Norton East to South curve Act passed. Line to be built at the expense of the Stockton and Hartlepool Railway. Speed restriction imposed on tight curve. |
| 30/06/1842 | Stockton and Hartlepool Railway
Act passed to legalise the company. |
| 23/05/1844 | Stockton and Hartlepool Railway
Forms the Hartlepool West Harbour and Dock Company to build a new dock at Stranton near Hartlepool. |
| 16/07/1846 | Leeds and Thirsk Railway
Second Leeds and Thirsk Act gives powers to open a line from Northallerton to Billingham on the Stockton and Hartlepool Railway, Eaglescliffe on the Stockton and Darlington Railway and Stockton on the Clarence Railway. |
| 16/07/1846 | Leeds and Thirsk Railway
Act for extension from Northallerton to meet the Stockton and Hartlepool Railway at Stockton. Plan to buy Stockton and Hartlepool Railway falls through. |
| 01/06/1847 | Hartlepool West Harbour and Railway
Opens new dock. Traffic to Port Clarence was to reduce causing friction between the Clarence Railway and the Stockton and Hartlepool Railway. |
| 31/12/1850 | Railway Clearing House
By this date, Ardrossan Railway, Caledonian Railway, Cockermouth and Workington Railway, Eastern Counties Railway, East Lincolnshire Railway, Fleetwood, Preston and West Riding Junction Railway, Glasgow, Dumfries and Carlisle Railway, Great Northern Railway, Huddersfield and Manchester Railway (London and North Western Railway), Manchester, Sheffield and Lincolnshire Railway, Maryport and Carlisle Railway, North British Railway, Preston and Wyre Railway, Dock and Harbour, Shrewsbury and Chester Railway, South Staffordshire Railway, Stockton and Darlington Railway, Stockton and Hartlepool Railway, St Helens and Runcorn Gap Railway, Stirling and Dunfermline Railway, Whitehaven Junction Railway and York, Newcastle and Berwick Railway join. |
| 01/01/1851 | Clarence Railway
Perpetual lease of line taken by Ralph Ward Jackson of the Stockton and Hartlepool Railway. |
| 30/06/1852 | Stockton and Hartlepool Railway
Hartlepool West Harbour and Railway
Merger authorised by Parliament along with lease or purchase of the Clarence Railway. |
| / /1853 | West Hartlepool Harbour and Railway
Diverts trains from Stockton station on the North Shore Branch (North Eastern Railway) to Stockton North station on the Leeds and Thirsk Railway. (The company controlled the former Clarence Railway and Stockton and Hartlepool Railway). |
| 17/05/1853 | Stockton and Hartlepool Railway
Hartlepool West Harbour and Railway
Clarence Railway
Merge to become the West Hartlepool Harbour and Railway Company. |
| / /1880 | Stockton and Hartlepool Railway
West Hartlepool station re-built. |
| / /1904 | Stockton and Hartlepool Railway
West Hartlepool station re-built. |
| / /1974 | Stockton and Hartlepool Railway
West Hartlepool station's up platform closed and up and down trains now use the down platform. Signalling and track alterations were cheaper than installing new lifts for access to the up platform. |
