The Bittern Line is a railway branch line in Norfolk, England, that links Norwich to Sheringham.^[1] It passes through the Broads on its route to an Area of Outstanding Natural Beauty on the north Norfolk coast.^[2] It is named after the bittern, a rare bird found in the reedy wetlands of Norfolk.

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Bittern Line
A Class 156 train at Worstead in 2008
Overview
Status	Operational
Owner	Network Rail
Locale	Norfolk, England
Termini	Norwich Sheringham
Stations	10
Service
Type	Heavy rail
System	National Rail
Operator(s)	Greater Anglia
Rolling stock	Class 755
History
Opened	1874–77
Technical
Line length	30 miles 22 chains (48.7 km)
Number of tracks	1–2
Character	Rural line
Track gauge	4 ft 8+1⁄2 in (1,435 mm) standard gauge
Route map (Click to expand)

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North Norfolk Railway (former M&GN to Melton Constable) Sheringham (NNR preserved station) Sheringham West Runton Cromer Beach Cromer High Roughton Road Norfolk and Suffolk Joint Railway to Yarmouth Beach via Mundesley-on-Sea Gunton (for Northrepps Aerodrome) to Cromer Beach via Mundesley-on-Sea to Yarmouth Beach M&GN to Melton Constable North Walsham Worstead Bure Valley Railway former line to County School Hoveton & Wroxham for The Broads River Bure Salhouse Wherry Lines to Great Yarmouth & Lowestoft River Yare River Yare Great Eastern Main Line to London Liverpool Street Norwich

The line is 30 miles 22 chains (48.7 km) in length and there are 10 stations. It is part of Network Rail Strategic Route 7, SRS 07.11, and is classified as a rural line.^[3]

Passenger services are operated by Greater Anglia, which also manages all of the stations.

The line was granted permission in 1864^[4] and the first stretch was opened between Norwich and North Walsham in 1874 by the East Norfolk Railway. It was extended to Cromer by 1877 before being extended to Sheringham in 1877, using a section of the Midland and Great Northern Joint Railway line. From the early twentieth century until the end of steam services, in 1962, the Great Eastern Railway operated coastal holiday services from London Liverpool Street under names such as the Norfolk Coast Express and The Broadsman.^[4]

Following the closure of the majority of the Midland and Great Northern network, the line operated as a single branch between Norwich and Melton Constable before the section between Sheringham and Melton Constable was closed in 1964.^[5] The remainder of the line was listed for closure in 1967^[6] but survived the proposal after being declined by the Secretary of State for Transport.^[7]

The Bittern Line Partnership was set up by Norfolk County Council in 1997. and was designated a community rail line by the Department for Transport in September 2007.

The section of the line between Sheringham and Holt which was closed in the 1960s remains in use as a heritage railway line operated as the North Norfolk Railway (NNR - also known as the Poppy Line). After a period of 36 years, the link between the Bittern line and the North Norfolk Railway was reinstated in 2010 with the opening of a new level crossing at Sheringham.

Sheringham railway station was upgraded in 2019 to accommodate the new Class 755s^[8]

The following table summarises the line's 10 stations, their distance measured from Norwich, and their estimated number of passenger entries/exits in 2018/19 and 2022/23:^[9]

Passenger services are operated by Greater Anglia. The typical service is one train per hour in each direction between Norwich and Sheringham. Calling patterns are varied, with some trains stopping at all stations while others omit some of the lesser-used stations along the line, such as Salhouse, Gunton and Roughton Road.

In 2019, new Class 755 bi-mode trains began to replace the previous mixture of Class 153, Class 156 and Class 170 diesel multiple units.^[10]

The line is also used by freight trains which are operated by GB Railfreight. Some trains carry gas condensate from a terminal at North Walsham to Harwich International Port.

The line is double-track from Norwich to Hoveton & Wroxham, where it becomes single-track with a passing loop at North Walsham, and two platforms at Cromer also allowing passing. The line is not electrified; it has a loading gauge of W8 between Norwich and Roughton Road and W6 from Roughton Road to Sheringham. The maximum speed is 75 miles per hour (121 km/h).^[3]

The line was re-signalled in 2000, leading to the closure of a number of mechanical signal boxes and control moving to a panel at the Trowse Swing Bridge control room. This saw the end of one of the few remaining sections of single-track main line controlled by tokens.^{[citation needed]} The Cromer signal box has been preserved.