Reply to "twin coil switch machine limited to one activation per minute"

I have a ton of NJ switch machines on my layout.  I drive them with 14 VAC.  I use 28  volt center tap transformers which provides two 14 volt taps.  The transformers source plenty of amps to provide the switch machine inrush current.  No need for capacitance discharge units.  You can wire the non-derailing using the NJ leaf contacts as Rob described above.  Frankly IMHO the leaf contacts are a PITA.  I use the NJ leaf contacts to control the coil on a relay which handles the switch machine coil high currents, latching which eliminates switch machine burnout and signaling.