what is -2f which connect the station with subway?

Question

Subway entrance / exit connect -2F of the railway station. Exit/ Entrance A leads to North Square and Exit/ Entrance B leads to South Square.

James · Answer

That means you can find the subway directly in the station, the second floor underground. Form Exit A you can get to North square and B to south square.

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what is -2F which connect the station with subway?