The Richmond, Fredericksburg and Potomac, which owned the 117 miles of track between Washington and Richmond, was co-owned by six different railroads that all used it as a bridge line between northern and southern cities. This timetable shows that in 1955 it operated 15 passenger trains a day in each direction between DC and Richmond.
Click image to download a 10.7-MB PDF of this timetable contributed by Ellery Goode.
While all trains to Washington went to Union Station, Richmond had two different stations. Four of the 15 trains stopped only at the Seaboard/Chesapeake & Ohio Main Street station, eight stopped only at the ACL/Norfolk & Western Broad Street station, and three stopped at both.