page_title: Brighton main line
section_title: Bi-directional signalling
hierarchical_section_title: Brighton main line / Route / Bi-directional signalling
caption_attribution_description: English: Up direction signals outside Haywards Heath tunnel The left hand signal (T348) controls trains travelling normally in the Up direction. The right hand signal (T350) controls trains travelling in the Up direction over the Down line. A train arriving at this signal has just passed through the Keymer Jn to Haywards Heath bi-directional section.
context_page_description: The Brighton main line is a major railway line in the United Kingdom that links Brighton, on the south coast of England, with central London. In London the line has two branches, out of London Victoria and London Bridge stations respectively, which join up in Croydon and continue towards Brighton as one line. The line is electrified throughout using the third rail system.
  Aside from London and Brighton themselves, the line serves multiple large urban areas along its route, including Redhill, eastern Crawley, Haywards Heath and Burgess Hill. It also serves London Gatwick Airport – the second-busiest passenger airport in the country.
  In addition, the line operates as a "trunk" route for both mainline and suburban services all across Sussex, east Surrey and the southern boroughs of London. Towns such as Sutton, Epsom, Caterham, Reigate, East Grinstead, Eastbourne, Horsham, Hove, Worthing, Littlehampton, Bognor Regis and Chichester do not lie directly on the line, but are instead linked to London by means of a railway line that connects onto the Brighton main line.
context_section_description: Between Balcombe Tunnel Junction and Preston Park, the line reduces from four tracks to two, with only a short quadruple-tack passing loop between Copyhold Junction and Haywards Heath South Junction (through Haywards Heath station). A broken-down train in this section causes the most disruption; therefore, to minimise the effects, the line is divided into four sections of bi-directional signalling, which allows trains to cross over and run on the right-hand track (i.e. "the wrong way"). These are:
  Balcombe Tunnel Junction to Copyhold Junction;
  Copyhold Junction to Haywards Heath South Junction (outer tracks only);
  Haywards Heath South Junction to Keymer Junction;
  Keymer Junction to Preston Park station.
  At the passing loop through Haywards Heath, the two inner tracks are only signalled bi-directionally south of Haywards Heath station itself, which allows trains to reverse at the station to/from the south. North of the station these tracks can only be used in their respective directions.
caption: Normal-running and 'bi-directional' signals outside Haywards Heath tunnel
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