It’s just an off cut piece of rail. It’s now been moved.Did you need that extra bit of guard rail past the switch on the right hand side? Seems strange, although that is a "S" curve (I think you guys call it a reverse curve)
I’ve tested it briefly with my 2095 to make sure there were no issues and all of the clearances were ok.The curves look very nice and "natural"... have you had a chance to test and demonstrate the much smoother running of your trains yet! Definitely no longer looks "toylike"