Subway Stations with Two-Tiered Structure There are some subway stations where the platforms of the up and down lines (or the A and B lines) are not aligned, but instead are stacked on top of each other. Subways are usually built directly under roads, but if the width of the road is narrow, the width of the underground subway structure is also restricted, resulting in a two-tiered structure. Otherwise, the subway structure would encroach under privately owned land along the road. In addition, even if the road is wide enough, the two-tiered structure may not be able to provide a wide enough space underground due to conflicts with existing structures. One example is Hatsudai Station on the Keio New Line. The piers supporting the elevated Metropolitan Expressway No. 4 stand in the center of National Route 20, and the foundation piles for them are driven underground. To avoid this, the station could not be made wider, and the upper and lower platforms were stacked on top of each other.
This is a real station on a bridge Since there is a station in a tunnel, there must be a station on a bridge as well. …… and this is not a joke, it really exists. And there are more than one. Usually, a “station on a bridge” refers to a station with a bridge over a railroad track as a “free passageway” where station facilities are integrated into the bridge. This type of station can be found everywhere in Japan. Unlike this type of station, however, there are cases where the station is really “on the bridge,” and this is a real station on a bridge. The first example is Mukogawa Station on the Hanshin Electric Railway main line. As the name suggests, the platform is on the Mukogawa bridge. This is a branch station of the Mukogawa Line, which runs north-south along the right (west) bank of the Mukogawa River, so the Mukogawa Line platform is above ground. In addition, Nadachi Station on the Hokuriku Main Line (now part of the Echigo Tokimeki Railway and Nihonkai Hisui Line) also has a station on a bridge. However, the Nadachi River bridge itself is only 60 meters long, and the station extends in front of and behind it. Part of the platform is on the bridge. Like the Tsutsuishi Station discussed in the previous issue, Nadachi Station appeared in its current form when it was replaced by a new double-track line. A river runs between the tunnels, and the station was built on a bridge over the river. Another interesting station is Tosa-Kitagawa Station on the Tosan Main Line, which has a platform inside a truss bridge. The platform is sandwiched between the upper and lower tracks, and the entire set is contained within the truss bridge. In fact, this station was also shaped like this when the tracks were replaced as a countermeasure against disasters. The station is located in a valley between two tunnels in a mountainous area, where it crosses a river.
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