In TSRE try keeping a good line-of-sight to the object while you fly
away from it towards and across the nearest tile border. Try selecting then.
Oh, and an earlier version of TSRE had a bug where some placed objects were not selectable after placement and saving.
This has been fixed in latest version
.
I had this happen several times re-doing the PRR-East but they were all treeblocks that I somehow a.) the object was in Place New mode. and b.) the cursor(pointer) was somewhere in the sky. I was able to select these very visible 'rogue' objects by flying to a neighboring tile but as yours in on the ground and under a bridge to boot, it's gonna be tough.
Turning terrain off for that subtile may make it easier to see from a distance.
The new editor taught me that it doesn't like 'idle' mouse clicks, My bad habit is tapping a finger when working out a problem. http://www.elvastower.com/forums/public/style_emoticons/default/whistling.gif
regards,
vince