Fort Sam Houston, a base of the U.S. Army in San Antonio, once had connections to the the Union Pacific yard (formerly Southern Pacific Railroad) to the south and the UP mainline (formerly Missouri-Kansas-Texas Railroad) to the east. The majority of the tracks inside the base were gradually abandoned and removed in the 1980s to 1990s.

Today, most of the right-of-way outside the base from the UP mainline remains but is overgrown. The tracks inside Fort Sam itself are mostly gone as much of the base has been reconstructed, but some remnants and crossings remain, as is typical of former rail installations within military camps. The rail bridge over the highway on the south side was torn down in 2008; most of the right-of-way along Walters Street was visible until 2012 when it was erased by the widening of the road. A bridge and the route between where the rail overpass once was and the UP yard are still visible.