Northampton Loop Line - History

History

When the London and Birmingham Railway (L&BR) was constructed in the 1830s, Northampton was by-passed, with the line running on high ground to the west via Kilsby Tunnel. Traditionally this was said to have been because Northampton landowners objected to having a railway run to the town. However, more recently, railway historians have argued that Northampton was by-passed because the gradients would have been too steep for early locomotives to easily cope with. Robert Stephenson the engineer of the London and Birmingham Railway was determined to avoid gradients steeper than 1:330. As Northampton is located in the Nene Valley, 120 feet (37 metres) lower than Blisworth, the closest point the L&BR came, connecting the town would have required gradients steeper than this.

This meant however that Northampton, despite being a large town, did not have direct rail links to London. A branch from the main line was built to Northampton in the early 1840s, the Northampton and Peterborough Railway, from Blisworth, which gave the town indirect rail links to London and Birmingham.

The loop line was constructed in the late 1870s by the London and North Western Railway and was opened in 1881 (by this stage locomotives had become far more powerful). It was constructed to improve rail services to Northampton and give the town a direct link to London. It also had the advantage of doubling capacity on the line from Roade to Rugby without the expense of widening the tunnel at Kilsby.

The line was electrified along with the rest of the WCML during the 1960s in the wake of the BR 1955 Modernisation Plan.

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