The land within a triangle is cut off from the adjacent area (and normally fenced off) and has marginal value, so will be purposed mainly for the railway's exclusive use – generally be used for maintenance depots, storage, or vehicle parking. The triangular shape tends to be unsuited for rectangular buildings. On electrified lines substations tend to be located inside triangles, in part because the land is cheap, and also because it provides the most convenient and flexible sectioning arrangements.
