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The Callahan Subdivision is a CSX Transportation railroad subdivision within the Jacksonville Division on the former Seaboard Air Line Railroad. The sub extends northward 20 miles from Baldwin, Florida, where the Jacksonville Terminal Subdivision's S Line and Florida Gulf & Atlantic Railroad meet just north of Baldwin Yard, a classification yard. According to Jacksonville Division Timetable Number 4 published in 2005,[1] the sub runs from milepost SM 0.18 to milepost SM 20.0, where it joins the Nahunta Subdivision, a former Atlantic Coast Line Railroad, in Callahan, Florida. The line serves as a bypass to Jacksonville.