A paired track has always existed, as this route shares a route with other railroads approaching the St. Louis area. In much of the St. Louis area, all railroads operated via the jointly owned Terminal Railroad Association of St. Louis (TRRA). And Amtrak trains to and from Chicago are able to enter and exit St. Louis via two different routes. Historically, trains would usually switch to and from the TRRA at WR Tower, crossing the Mississippi River via Merchants Bridge, the most northerly of the river crossings in St. Louis. But in recent years, trains would more often use the MacArthur Bridge, immediately west of downtown St. Louis. The connection with the TRRA for that route is at Q Tower.
Radio Frequency - 160.560 (AAR Channel 30) (Wann-Q Tower)
Radio Frequency - 160.500 (AAR Channel 26) (Q Tower-MacArthur Bridge-St. Louis)
Radio Frequency - 160.500 (AAR Channel 26) (WR Tower-Merchants Bridge-St. Louis)
262.9 Wood River (NS crossing)
268.8 CP North Lenox
269.7 Lenox (junction-UP)
275.5 WR Tower (junction-TRRA)
280.0 Bridge Jct.
281.0 Q Tower (junction-TRRA)
----- 14th Street
----- St. Louis Amtrak
----- 23rd Street
Wann to WR Tower: 2 tracks, paired track. West track: signaled southbound only. East track: CTC in use.
WR Tower to Q Tower: 2 tracks, CTC in use.
This line is being upgraded for high speed operation, resulting in some changes.