North Downs Line

The North Downs Line is a railway line in South East England. It runs for from in Berkshire to in Surrey. It is named after the North Downs, a range of chalk hills that runs parallel to the eastern part of the route. The name was introduced in 1989 by Network SouthEast, the then operator. The North Downs Line serves the settlements in the Blackwater Valley as well as the towns of Guildford, Dorking and Reigate. It acts as an orbital route around the south-west of London and has direct connections to the Great Western Main Line at Reading, the Waterloo–Reading line at , the Alton line at , the Portsmouth Direct line at and the Brighton Main Line at Redhill.

Three different operators run passenger services on the North Downs Line. Great Western Railway runs services along the entire length of the line from Reading to Redhill, the majority of which continue along the Brighton Main Line to . Southern trains between and use a section west of Redhill. South Western Railway services between the capital and Reading use the line west of Wokingham and the same company operates between Guildford and en route to .

The majority of the North Downs Line was constructed by the independent Reading, Reigate and Guildford Railway company (RG&RR), although the section between Guildford and Ash Junction was built by the London and South Western Railway. The line opened in 1849 and services were run from the outset by the South Eastern Railway, which took over the RG&RR in 1852. Three sections of the line were electrified by the Southern Railway in the 1930s although around remain unelectrified. In the early 21st century, infrastructure works to increase the capacity of the line were undertaken, including the provision of new platforms at Reading and Redhill.

Route

Overview

The North Downs Line is a railway line in South East England. It links Reading railway station on the Great Western Main Line in Berkshire to on the Brighton Main Line in Surrey. It serves the settlements in the Blackwater Valley on the borders of Hampshire, Surrey and Berkshire, as well as the Surrey towns of Guildford, Dorking and Reigate. It acts as an orbital route bypassing the south-west of London and has direct connections to the Waterloo–Reading line at , the Alton line at and the Portsmouth Direct line at . In 2006, Network Rail classified the North Downs Line as "congested", but, following the construction of new infrastructure, this status was revoked in 2023.

Reading to Guildford

thumb|right|upright=1|Passenger services on the North Downs Line: The stopping pattern of GWR services varies according to the time of day, and no train calls at all stations.

The Reading to Guildford section of the North Downs Line is in length and has 13 stations in total. Reading and Guildford stations are managed by Network Rail and have 15 and 7 operational platforms respectively. The other 11 stations have two platforms each. , , , Wokingham, Ash and stations are managed by South Western Railway (SWR). , , , and stations are managed by Great Western Railway (GWR).

and to Guildford, operated by SWR using units

West of Wokingham Junction and east of Aldershot South Junction, this part of the line is electrified using the 750 V DC third-rail system, leaving an unelectrified central section. Most services on the North Downs Line use platforms 4, 5 and 6 at Reading station, but access to other platforms is possible. The Reading station area is controlled from Thames Valley rail operating centre, the line from Earley to North Camp is controlled by Basingstoke rail operating centre, and the section from North Camp is controlled by Guildford signal box. The majority of this section has a line speed of with the exception of the approaches to Reading, Wokingham and Guildford stations, and a restriction at Ash Junction where the line curves sharply. The steepest gradient, to the west of Guildford, is 1 in 100.

The Waterloo–Reading line diverges from this part of the North Downs Line at Wokingham Junction, and a spur to the Alton line joins at Aldershot South Junction. In addition, the line passes beneath the South Western Main Line at Farnborough, but there is no longer a junction between the two. This section passes over two navigable waterways, the River Kennet and the Basingstoke Canal, as well as the unnavigable River Loddon and its tributary, the Blackwater.

{|class="wikitable sortable collapsible"

|+ class="nowrap"|Stations between Reading and Guildford

!scope="col"|Station

!scope="col"|Mileage

!scope="col"|Number of platforms

!scope="col"|Managing company

!scope="col"|Trains operated by

!scope="col"|Opening date

!scope="col" class="unsortable"|Original name

!scope="col" class="unsortable"|Ref.

|- style="background:#F8F8FF"

||| from via

||15||Network Rail|| GWR SWR CrossCountry Elizabeth line|||| ||

||| from Charing Cross via Redhill

||2||SWR||SWR|||| ||

||| from Charing Cross via Redhill ||2||SWR||SWR|||| ||

||| from Charing Cross via Redhill ||2||SWR||SWR GWR