t-trak R19 classic-style inside/outside corner

Somebody asked me to design a R19 curve corner module that looks like the R12 inside corners, so here it is.

This takes the R480 super elevated double-concrete track, one 45 and one set of easements.

I only designed the deck, didn't get around to designing the cuts for the sides yet, but I'm including the STL so you can have it yourself to finish.