[2] A station having dual side platforms, one for each direction of travel, is the basic design used for double-track railway lines (as opposed to, for instance, the island platform where a single platform lies between the tracks).
[3][4] In some stations, the two side platforms are connected by a footbridge or tunnel to allow safe access to the alternate platform.
[3] While a pair of side platforms is often provided on a dual-track line, a single-side platform is usually sufficient for a single-track line.
[5][6] In some situations, a single side platform can be served by multiple vehicles simultaneously with a scissors crossing provided to allow access mid-way along its length.
In some situations, a single side platform may be in use with the other one (side platform) disused like with Ryde Esplanade.