means "city") systems which are called metro in French, Italian, Spanish, Portuguese, Danish, Finnish, Polish, Dutch, and Russian. Subway used in a transit sense refers to a rapid transit heavy rail system that goes underground. The term may refer only to the underground parts of the system, or to the full system. Subway is most commonly used in the United States and the English-speaking parts of Canada, though the term is also used elsewhere, such as to describe the Glasgow Subway in Scotland, and in translation of system names or descriptions in some Asian and Latin American cities. In some cities where subway is used, it refers to the entire system; in others, only to the portions that actually are underground. Naming practices often select one type of placement in a system where several are used; there are many subways with above-ground components, and on the other hand, the Vancouver SkyTrain and Chicago "L" include underground sections. Historic posters referred to Chicago's Red & Blue lines (then called the State Street & Milwaukee/Dearborn lines) as "the subway lines". Light metro Medium-capacity system (MCS), also known as light rapid transit or light metro, is a rail transport system with a capacity greater than light rail, but less than typical heavy-rail rapid transit. Sub-surface subway Some light rail / street car lines that have underground sections that are referred to as subway are often sub surface subways. Notably, Boston's Green Line and the Newark City Subway, each about half underground, originated from fully surface streetcar lines. Also, the Buffalo Metro Rail is referred to as "the subway", while it uses light rail equipment and operates in a pedestrian mall downtown for half of its route and underground for the remaining section. Sometimes the term is qualified, such as in Philadelphia, where trolleys operate in an actual subway for part of their route and on city streets for the remainder. This is locally styled subway-surface. When the Boston subway was originally built, the subway label was only used for sections into which streetcars (trams) operated, and the rapid transit sections were called tunnels. Also, in some countries, subway refers to systems built under roads and the informal term tube is used for the deep-underground tunnelled systems (such as London's Piccadilly line) – in this usage, somewhat technical nowadays and not used much in London, underground is regardless the general term for both types