San Franciscos Rail System Crossword Clue — 4 Letters

One confident answer with explanation of the wordplay

BART
Best match
B
A
R
T

BART stands for Bay Area Rapid Transit, which is the rail system serving San Francisco and the surrounding Bay Area. This is a very common crossword answer for this clue.

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Other possible answers
MUNIMuni (San Francisco Municipal Railway) also serves San Francisco with light rail/streetcar lines, though it's more commonly associated with buses and streetcars rather than a 'rail system' specifically.

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