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Depends on era, of course. In the period 1900-1960, the typical spacing between two main tracks, or main track and siding, was 14', pushed out to as much as 16' on tight curves to allow for overhangs, and to 16' to 18' to clear signal masts between the tracks. For yard tracks, the common center was 13', but 12'-6" and 12' were fairly common. About the absolute minimum was 11'-6". Today, the trend is toward wider centers in both yards and on main tracks. New main tracks are often built with 25' to 50' centers so that maintenance can be done on one track without the requirement for restricted speed or a Form B on the other. OS
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