Ludgate Circus

Thameslink is a mainline route on the British railway network, running from Bedford, Luton, St Albans City, Peterborough, Welwyn Garden City, London Blackfriars and Cambridge via central London to Sutton, Orpington, Sevenoaks, Rainham, Horsham, Three Bridges, Brighton and East Grinstead. The network opened as a through service in 1988, with severe overcrowding by 1998, carrying more than 28,000 passengers in the morning peak. All the services are currently operated by Govia Thameslink Railway. Parts of the network, from Bedford to Three Bridges, run 24 hours a day, except on early Sunday mornings and during maintenance periods.

Clerkenwell is an area of central London, England.

The River Fleet is the largest of London's subterranean rivers, all of which today contain foul water for treatment. It has been used as a culverted sewer since the development of Joseph Bazalgette's London sewer system in the mid-19th century with the water being treated at Beckton Sewage Treatment Works. Its headwaters are two streams on Hampstead Heath, each of which was dammed into a series of ponds—the Hampstead Ponds and the Highgate Ponds—in the 18th century. At the southern edge of Hampstead Heath these descend underground as sewers and join in Camden Town. The waters flow 4 miles (6 km) from the ponds.

King's Cross Thameslink station is a closed railway station in central London, England. It is located on Pentonville Road, around 250 metres (0.2 mi) east of King's Cross mainline station. At the time of closure, in 2007, it was served by Thameslink trains and managed by First Capital Connect. Services have been transferred to a new station underneath St Pancras.

Farringdon is an interchange station located in Clerkenwell, London, England, in the London Borough of Islington, just outside the boundary of the City of London for London Underground, Elizabeth line and National Rail services.

Snow Hill tunnel is a railway tunnel on the northern edge of the City of London which carries the up and down Snow Hill lines between City Thameslink and Farringdon stations. The tunnel runs beneath the Smithfield meat market and was constructed, using the cut-and-cover method, immediately prior to the building of the market. The tunnel opened on 1 January 1866.

Ludgate Hill is a street and surrounding area, on a small hill in the City of London, England. The street passes through the former site of Ludgate, a city gate that was demolished – along with a gaol attached to it – in 1760.

City Thameslink is a central London railway station within the City of London, with entrances on Ludgate Hill and Holborn Viaduct. The station is on the Thameslink route between Blackfriars to the south and Farringdon to the north.

Holborn Viaduct is a road bridge in London and the name of the street which crosses it. It links Holborn, via Holborn Circus, with Newgate Street, in the City of London, England financial district, passing over Farringdon Street and the subterranean River Fleet. The viaduct spans the steep-sided Holborn Hill and the River Fleet valley at a length of 1,400 feet (430 m) and 80 feet (24 m) wide. City surveyor William Haywood was the architect and the engineer was Rowland Mason Ordish.

Holborn Viaduct was a railway station in the City of London, providing local and commuter services. It was located to the southeast of Holborn Viaduct, and east of Farringdon Street.

Ludgate Hill was a railway station in the City of London that was opened on 1 June 1865 by the London, Chatham and Dover Railway (LC&DR) as its City terminus. It was on Ludgate Viaduct between Queen Victoria Street and Ludgate Hill, slightly north of St. Paul's station on the site of the former Fleet Prison.

London Buses route 63 is a Transport for London contracted bus route in London, England. Running between King's Cross station and Honor Oak, it is operated by Transport UK London Bus.

The Thameslink Programme, originally Thameslink 2000, was a £6 billion project in south-east England to upgrade and expand the Thameslink rail network to provide new and longer trains between a wider range of stations to the north and to the south of London. The development facilitated new cross-London journeys, which means that passengers no longer have to change trains in London. Work included platform lengthening, station remodelling, new railway infrastructure, and new rolling stock. The project was originally proposed in 1991 following the successful introduction of the initial Thameslink service in 1988. After many delays, planning permission was granted in 2006 and funding was approved in October 2007. Work started in 2009 and was completed on 18 September 2020, although trains over the new routes began running in 2018.

Farringdon Without is the most westerly ward of the City of London, England. Its suffix Without reflects its origin as lying beyond the City's former defensive walls. It was first established in 1394 to administer the suburbs west of Ludgate and Newgate, including West Smithfield and Temple. This was achieved by splitting the very large, pre-existing Farringdon Ward into two parts, Farringdon Within and Farringdon Without. The large and prosperous extramural suburb of Farringdon Without has been described as having been London's first West End.

The Widened Lines is a double-track railway line forming part of the Thameslink route between St Pancras and Farringdon within Central London.

The A201 is an A road in London, England running from Kings Cross to Bricklayer's Arms.

The Holborn Viaduct–Herne Hill line is a railway line between Holborn Viaduct in the City of London and Herne Hill in the London Borough of Lambeth. After the closure of Holborn Viaduct station the line ends at the south portal of Snow Hill tunnel merging into Snow Hill lines. From there the Widened Lines to St Pancras and Kentish Town are reached. Today the section north of Blackfriars is part of the Thameslink core. Originally being a branch line of the London, Chatham and Dover Railway (LCDR) towards the City of London, the line is sometimes called LCDR City Branch.