I bought a" used" ,though in fact brand new,Peco code 75 double slip insullfrog for a single point price to try out on my US code 83 and possible code 70 dead frog layout .Despite being dead frog it works fine with my DCC /DC brass steam and plastic diesel switching layout .No isolating whichis sad as I use a MRC Tech 6 which only runs one loco at a time and rely on isolating locos via points isolation.i will install a few switches to isolate the tracks but it all works well . I use Woodland scenic underlay and foam cement so its eesy peezy to alter track layout .I though maybe i would need fancy point motors and wiring but it just lays there working and solving a track layout problem .Pleased I didnt pay full price though .