COLUMBIA — On Tuesday, the southbound lanes of U.S. 63 will be restricted to one lane while the Columbia Terminal Railroad performs routine repairs on the tracks, according to a city news release. Maintenance at the crossing, located in north Columbia between Paris Road and Brown Station Road, will be done during the middle of the day and is expected to last about four hours. The repairs are a part of ongoing track maintenance, said Connie Kacprowicz, the public information specialist for the city.