surface subway
 n.— «One thing that Aaron should absolutely be ashamed of himself for is his use of the phrase “surface subway.” Subways and elevated trains speed people along because they’re grade-separated. You just can’t go that fast on the surface, even if you have a dedicated right-of-way and signal priority. A surface subway is nonsense.» —“I Want a Nice Big Imitation Steak” Cap’n Transit Rides Again Jan. 19, 2009. (source: Double-Tongued Dictionary)

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  1. Here is something close. Part of Philadelphia transportation system is known as “subway surface.” These are trolley cars that run on the streets at the outer portion of the city and then descend into subway lines when they get near the center of the city.

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