The bridge in the foreground is from MTH, 
It is 32x10 15/16 x13 Product Number 49-1062, $99.
The two in the background were custom made based on a section of curved O72 track. I took it to a plumbing/sheet metal shop and had them cut me a piece of .032 sheet metal as the base, and had them put a gusset as a stiffner on the bottom. As it turns out that was really a good thing. When my scale Big Boy crosses it, the boiler swing is so wide that it extends over the top of the side when crossing. I wouldn't think it would matter with the WYE as long as the switch is on the table top. Constant movement of the switch would be really tempting fate in my opinion.
