Line 10 is next to Line 20. Now, let’s take a look at the map of JR Tokyo Station. Basically, the numbers are assigned according to the rule that station numbers are assigned from the side closest to the station bookstore. In the case of private railway companies, the numbers are assigned from the left toward the direction of the down train (e.g., Odakyu). In the case of Tokyo Station, the starting point is the brick station building on the Marunouchi side. Then, the Chuo Rapid Line is on Lines 1-2. The Keihin-Tohoku Line northbound, Yamanote Line inbound, Yamanote Line outbound, and Keihin-Tohoku Line southbound have one line each, and the Tokaido Main Line – Ueno Tokyo Line northbound and southbound have two lines each to the east of the Keihin-Tohoku Line northbound and southbound. This makes lines 1 through 10. However, the Tohoku Shinkansen platform on the east side of the line suddenly starts from platform 20, which has four tracks on two sides, so it is tracks 20 to 23. On the Tokaido Shinkansen line to the east of that platform, the numbers are reversed to lines 14-19. This does not conform to the rule that the numbers are assigned in order from the side closest to the station bookstore. However, this is partly inevitable from a historical perspective. In the past, there were only platforms for conventional lines and the Tokaido Shinkansen, which were usually numbered consecutively. However, Line 11 was a machine line without a platform, i.e., a line used for transferring locomotives to the other side of the line, and including this line, the conventional lines were numbered 1-13, and the Tokaido Shinkansen lines were numbered 14-19 (there are some examples elsewhere where lines without a platform are also numbered). However, when the Tohoku Shinkansen entered Tokyo Station, the conventional Shinkansen platforms numbered 12 and 13 were converted to Shinkansen platforms. The Shinkansen platforms were also numbered 12-13 at that time, but in 1997, when the Tohoku Shinkansen added a platform, the platform numbers were changed to 20-23. At that time, the platform for the Chuo Line was added on the conventional line side, and the platform was moved to the current configuration, which has up to platform 10. If the Shinkansen platforms were numbered consecutively from there, track No. 14 would be created, which would overlap with the Tokaido Shinkansen platforms. It would be easier to explain the situation by saying, “The Tohoku Shinkansen platform is platform 2x.
There are various cases of platform number jumps at other stations as well. For example, at Kyoto Station, the platform facing the station building on the north side is platform 0. The Kyoto Line (Tokaido Main Line) is on tracks 2 to 7, the Nara Line on tracks 8 to 10, and the Tokaido Shinkansen on tracks 11 to 14. So far, this is understandable, but the platforms for the Sagano Line (Sanin Main Line) suddenly jump to tracks 30-34. However, no matter how big Kyoto Station is, it does not have more than 30 lines of platforms. This is the result of intentional skipping numbers. What about Tsuruga Station, which will be the final stop of the Hokuriku Shinkansen line when it is extended and opened? Here, the conventional lines are on Lines 1-2 of the Obama Line and Lines 3-7 of the Hokuriku Main Line (Line 4 is a notched platform at the end of Line 5), but the Shinkansen trains jump to Lines 11-14, and the platforms for the conventional limited express lines directly below them are on Lines 31-34. In addition to the above, there are often cases where the numbering of only the Shinkansen platforms is skipped. Shin-Omura Station, shown in the photo at the beginning of this article, is one such example. The purpose of this may be to separate the range of numbers to make it clear that “this is for Shinkansen” and “this is for conventional lines”.
Odawara Station, where lines are numbered by different operators When different lines of different operators serve the same station and each has its own station, it is normal for each line to have its own numbering system. For example, at Shinjuku Station, the JR, Odakyu, and Keio lines each have their own “Line 1,” from which the numbers are incremented by one. However, the situation is different at Odawara Station, the last stop on the Odakyu Odawara Line. The Odakyu platforms are Lines 7 through 10. In fact, the platforms are numbered consecutively with those of the Izu Hakone Railway’s Oyuzan Line at the eastern end, which are numbered 1-2, and JR East’s Tokaido Main Line, which are numbered 3-6. The Tokaido Shinkansen of JR Tokai Line, located at the western end of the line, is on Lines 13-14, which is slightly different from the other lines. This is because the platform of the Hakone Tozan Railway used to be lines 11-12, and the line continued to this platform (line 12 is not numbered now). In other words, Odawara Station is numbered by five different companies, and it is unusual for two companies or so to be numbered by five different companies.
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