All my track is EZ track and all my turnouts are Bachmann pre-DCC. I am going to use a NCE DCC system to control all of the turnouts using NCE stationary decoders. So first I noticed that I have 2 types of toggles, A) left or right and B) left or right then momentarily push. Are there two types of switch machines in use? If not what type am I using? (STALL or?)

Secondly, there are a combo of 3 green wires going from the switch machines to the toggles. Is the middle one a common or ground wire?