Gentlemen,
You are not going to like this but, I will tell you I got rid of every new Lionel 072 switch I owned, I use the older 072 Lionel switches including some very old 072's from my fathers original Tin Plate 263E with my FasTrack, and it runs like glass. What prompted this was the Weaver Masonic Engine, the front trucks would not run thru any of the curved sections of the new Lionels 072 switches, it derailed every single time. I just got rid of the switches and acquired two more old sets, there is something different about the new 072 Lionel switches, I did not bother to do any engineering investigation to see
what the problem really was, did not have time to re-engineer brand new switches, nor should you have too. Running back to back switches in many places as I do on my layouts, the switches must work correctly for every engine and every piece of rolling stock. I recommend runners stay away from the new 072 Lionel switches, now the new K-Line 072 are a completely different story, if you are going to go with the newer switches make it K-Line, or Ross.
PCRR/Dave
Notice the double set of 072 switches in front of the Pa Silver passenger car with the black roof,
the switch under the complete silver car is a lot older than I am and it works perfect everytime, it does take some power however. Every engine and every piece of roling stock runs thru my old 072
Lionel switches, can't say the same for the new ones.