In this scene from October 2008, UP coal train CJRCF 29 is being pushed up the Merchants Bridge West Approach by its DPU.
Meanwhile, UP train MTRKS 31 has been waiting patiently for the coal train to clear. It can now continue its journey toward downtown St. Louis.
Going through my old photos, I see many Union Pacific trains using the TRRA to go through the city. Today, I don't think the UP uses the TRRA in the same manner.
Terminal Railroad Association
Merchants Sub
Bremen Ave.
St. Louis, Missouri