| Third rail (proposed)|
| Kent and Surrey, United Kingdom|
4 ft 8 ⁄2 in (1,435 mm) (proposed)
15 miles 64 chains (25.43 km) (proposed)
The Southern Heights Light Railway was to have been a railway between Orpington, Kent and Sanderstead, Surrey. It was authorised in 1925, but ultimately not constructed. The engineer was to have been H. F. Stephens and the line was to have been constructed under the Light Railways Act 1896.
Southern Heights Light Railway Wikipedia
The Southern Heights Light Railway was proposed in the mid 1920s. Colonel H. F. Stephens was the engineer. The line was first mentioned in March 1925 when an inquiry into the proposed line was held at Orpington, Kent. The railway was to have cost £511,148 to build, or about £40,000 per mile. It was to have been a single track railway constructed across the North Downs. The Light Railway Order was granted on 29 December 1928. In a departure from Stephens' usual practice, there were to have been no level crossings at all on the line, which would have required 23 bridges to have been built. Construction of the line would have required the excavation of 631,000 cubic yards (482,000 m3) of material. In January 1931, authorisation was sought to deviate from the authorised route in an effort to reduce construction costs by £17,245. The line was to have taken a different route in Cudham, Tatsfield and Titsey, on the Kent/Surrey border.
The line was to have been electrified by the third rail system. It was to have been operated by the Southern Railway. Passenger trains would have been operated by electric multiple units, with steam locomotives handling freight trains. The scheme was dropped in the 1930s.
The proposed line would have served eight stations between Orpington and Sanderstead.Orpington
Green Street Green for Farnborough (1 mile 7 chains (1.75 km)).
Downe and Keston (3 miles 5 chains (4.93 km)).
Cudham and Biggin Hill (5 miles 14 chains (8.33 km)).
Westerham Hill (6 miles 11 chains (9.88 km)).
Tatsfield (8 miles 9 chains (13.06 km)).
Chelsham for Warlingham (11 miles 44 chains (18.59 km)).
Hamsey Green (12 miles 5 chains (19.41 km)).
Mitchley Wood (14 miles 12 chains (22.77 km)).
Sanderstead (15 miles 64 chains (25.43 km)).