Redhill Tunnel North Portal

The Redhill Tunnel North Portal consists of a pair of tunnel entrances, with the east tunnel dating from 1840 and the west tunnel from 1875, both featuring architectural enhancements from 1875. The engineers involved were Thomas Jackson Woodhouse and Charles Vignoles for the 1840 entrance, and J.S. Crossley and J. A. McDonald for the 1875 entrance.

Constructed from rock-face ashlar, the east entrance showcases a castellated and machicolated parapet that rises above a single central shield. To the right, there is an octagonal castellated turret with a corbel table, adorned with a single slit ventilator. Adjacent to this turret is a smaller circular castellated turret, also with a corbel table, featuring a decorative arrow loop. Flanking the entrance are lower sections of wall that have similar parapets.

The west entrance mirrors the east, with a similar parapet on the left, an octagonal turret on the left, and a circular turret on the right. Each side is bordered by sections of stepped castellated wall that end in smaller circular turrets, all of which are wider at the base.

The Midland Counties Railway was opened on 5 May 1840, and the Midland Railway was widened between Trent and Leicester in 1875. According to Pevsner, the original portal from 1839 had one tower, which was replicated to create a symmetrical composition in 1901 when the railway line was doubled.