Two M7s meet under the PLSs at Forest Hills.
If you're looking for rare signals, NYC is the place. LIRR has PLSs in volume, and is still installing new ones. SIRT is in the same position with its CPLs, and NJT/CSAO have myriad G types and Lackawanna-style signals. And of course, Amtrak has its CPLs on the NEC.