Makes sense, thanks. Was wondering why the tracks showed signs of recent-ish use but those bolts (as far as one can tell from the video) have that even coat of rust.
Looking at it a little more, it looks like the derailer head itself flips up so you can allow a train to pass. The unit was probably placed there some time ago. It actually goes under the rail, whereas a temp unit would probably just bolt on to the rail itself.
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