Premetro

Premetro is the concept of building rapid transit infrastructure with the goal to use rapid transit trains in the future, but in the meantime use tram vehicles preliminary. This infrastructure consists of tunnels and/or viaducts, so vehicles have no conflicts with other traffic.
The use of tram vehicles in tunnels originated in the USA in the nineteenth century and was often called "subway surface line" while in the second half of the twentieth century the term "semi-metro" was coined. Only when a semi-metro section is designed for later use of heavy rapid transit, it also falls in the premetro category. During the time when tram vehicles are used, the specific line falls into the light rail category.
== Examples ==
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Category:Rail Transportation