The first connection was from the Old Colony Railroad, the line to Quincy and beyond. That line crossed the Fort Point Channel a bit west of the current bridge, ending with passenger and freight terminals southwest of the current location of South Station (fully south of Kneeland Street). The beginning of the Union Freight Railroad split off the Old Colony Railroad between the bridge and the terminals, heading northeast to Federal Street and then north on Federal Street, a street that ran from the Dorchester Avenue Bridge straight to Dewey Square (the front of South Station).