[1] There is another Redhill Tunnel on the Midland Main Line south of Trent Junction.
The tunnel was built by the London Brighton and South Coast Railway as part of their line 'Quarry Line' designed to avoid the rail bottleneck at Redhill railway station.
Plans were drawn up by Charles L. Morgan, the Chief Engineer of the company.
[2] Authority for the new line was granted by the British Parliament in July 1896, and construction took place during 1898-9.
The entire munitions train was derailed filling a length of the tunnel with explosive debris, but fortunately there was no fire.