[ID: extract from National Rail's supplement to the london tube map, with commuter rail lines as well as the tube. this extract shows that map's depiction of the king's cross st pancras and euston area, large rail interchanges extremely close to each other that together become the busiest heavy rail terminus in the uk. both euston and KCSP, and the nearby farringdon, are depicted as an 'internal interchange', which means there are platforms connected by tunnels, as opposed to a regular interchange with multiple entrances on the surface. internals are depicted as circles connected solid bars, while externals are simply one circle. euston and farringdon have two connected circles, while KCSP has six. euston is also connected via a dashed line to ‘euston square’, indicating the two stations are less than ten minutes apart and foot traffic is encouraged (‘square’ is actually literally just outside the entrance of euston). the western lobe of euston is depicted as the terminus of the Lioness Line (orange) and the northwestern railway (lime with bars), which emerge from the station going northwest, depicted as being attached to each other. passing through this lobe is the western branch of the Northern Line (black). the eastern lobe of euston depicts the other branch of the Northern Line, coming from the north but turning east at euston to travel to KCSP, intersecting with the Victoria Line (azure), coming from the southeast before also turning east at euston to run parallel to the Northern Line towards KCSP, though with a gap between the two. no rail termini emerge from the western lobe of euston. the next stop on the western branch of the Northern Line after (western) euston is warren street, which also is the next stop for the Victoria Line after eastern euston, creating a right-angle triangle with the Victoria, western Northern, and the euston internal interchange. to western euston’s southwest via the ten-minute walk dashed line is euston square, which is an interchange for three tube lines, the Hammersmith City (salmon), the Circle (yellow), and the Metropolitan (dark magenta) all of which run next to each other horizontally. the three lines cross the northern-victoria-euston triangle without stopping at euston itself, towards KCSP.
KCSP is an intimidating Y shape of six lobes - three in a vertical line, then two emerging on the northwest spoke and one on the northeast. despite the name of this underground station, drawn as the internal interchange, being ‘king’s cross st pancras’, the giant Y is actually not labelled this at all - the western fork hovers near the label ‘st pancras international’ while the eastern hovers near ‘king’s cross’, and the southern fork remains unlabelled. the southernmost lobe of KCSP is for the glued-together Hammersmith, Circle and Metropolitan from euston square (not euston proper), after which the lines turn southeast to farringdon. this lobe also is for the Piccadilly line (navy), which comes from the northeast before turning south - the only Piccadilly stop in the KCSP-euston area. the middle of the three vertical lobes is for the Northern, travelling east from euston - and nothing else. the northernmost of the vertical lobes is for the Victoria - and absolutely nothing else. the Victoria crosses the Northern at euston whilst travelling diagonally, but then deliberately creates itself a gap before turning horizontal, to reach a separate lobe from the Northern due to KCSP being an internal interchange. both the Northern and Victoria politely duck under the Piccadilly after KCSP. from the Victoria lobe emerges the two spokes for king’s cross and st pancras international. King’s Cross is the terminus of the Great Northern (golden-brown, bars) and a branch of the Thameslink (maroon, bars), both heading north but separated by a tiny gap from each other. the first of the two lobes for SPI is the terminus for HS1 (blue, bars of yellow), which is absolutely not a commuter line - it goes to bloody Paris. this lobe is also bisected by a different branch of the Thameslink, going vertically, after which it sails over the Victoria, Northern and the triple glued-together lines, immediately after which it turns southeast, over the Piccadilly to farringdon. HS1 and this Thameslink out of SPI are once again separated by a tiny gap. the western lobe of SPI is the terminus of the EMR (cyan, bars), which emerges due north. the gap between the EMR and Thameslink is almost imperceptibly larger than the gap between Thameslink and HS1. after the lowest lobe of KCSP with which they intersect the Piccadilly, the triple lines (Hammer., Circle, Metro.) turn southeast to the northeasternmost of farringdon’s two lobes, with which they intersect nothing. this lobe is connected via an internal interchange to another, which is where it intersects the Thameslink coming from SPI, but also the Elizabeth Line (violet)/end ID]
