What are these for? I got a 1993 calendar with a photograph of a section of track in Vermond, in a covered structure; inside the main track was a piece of rail shaped like a diamond or the big “O” on the Olympia beer label. Outside the main tracks were separate sections of track like a pair of parentheses. The whole thing couldn’t have been more than fifteen feet from end to end. What is this for?? 
Some kind of switching device, maybe? I really have no idea. Just a WAG.
BTW, that was my very first mention of a “WAG”.
What’s a “wag”?
I would suggest maybe updating your calendar.
I wish to God I knew. But I think I was using it the right context. I was hoping no one would ask.
Wild Ass Guess
The early bird gets the worm, but the second mouse gets the cheese.
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My guess, WA or not, would be that the track was for some type of tram or trolley, not a regular train track. The section you saw would be the place where the tram car could be turned around to go back in the opposite direction. The “parentheses” might be places where a car could be sidelined for a while.
OK, 'fess up - who got that train track pregnant?
Didn’t Cecil cover this in MOTSD?
“His eyes are as green as a fresh-pickled toad,
His hair is as dark as a blackboard,
I wish he was mine, he’s really divine,
The hero who conquered the Dark Lord.”
But if you have data to back it up, it’s a SWAG. ( Scientific WAG.
VB
I’ve performed a complete diagnosis of your car. It’s broken.
- A Wally original!
The inside rails could also be a “re-railer”. They’re usual on the tracks close to sharp curves and on over-passes.
My fate keeps getting in the way of my destiny.