Spotted this in Commerce CA and it seemed to me more like something you would model (out of convience - a place to put some extra track panels) than something you would ever see in reality.
Those are new turnouts – appear to be #15s (good for 30 mph). This is the common way of shipping them. If they are to be installed in a main track that’s in service, they are assembled on “turnout pads” adjacent to where they will go, welded up, then slid into place with two or three rubber-tired loaders or speed-swings.
I remember occasionally seeing cars loaded with track sections passing by on the Conrail tracks in Sandusky Ohio, during the 80s & 90s…including whole diamonds. I always assumed they were for quick temporary repair of track tore up by derailments, until I saw one of the diamonds unloaded at the site where the N&W tracks to the coal docks crossed Conrail, and a few days later saw the old one swapped out and laying by the tracks…just a matter of quick and easy maintenance, I guess.