@Madockawando posted:@SteveH ... I have never used the O-72 Fasttrack switches before: . Is it necessary to use the curve extensions? ...
Thank you Madockawando and @Mike0289 for the kind words. 
To answer the question about O-72 switches, no it's not necessary if you are willing to trim back part of the roadbed of the adjoining pieces to fit into the switches. Using the 1-3/8" fitter pieces allows everything to go together without cutting. These fitter pieces also have the added advantage of removable jumper wires underneath that allow one to create an electrical break in the center rail for making an isolated block section. From the factory, each switch comes with two 1-3/8" half roadbed pieces (shown below) and one 1-3/8" no roadbed piece (used for joining the divergent ends back to back of O-60 and O-72 switches).
Note that the bottom cover plate has been removed from the one pictured above.
O-72 Wye switches also benefit from using the included fitter pieces.
