Connecting switch tracks separate power

Also does anyone know what terminal posts I should use on the Lionel R to do this?

Use a separate transformer to reserve power for the trains.

As long as the "R" is dedicated for switches, use one of the variable ranges... start with B-F.  If the switches snap nicely at a voltage in this range(adjust for best operation), you are all set.  Change over to A-F(again adjust for best operation) if you need more oomph.

thanks I use the R transformer only to power accessories now using the b-f. The f post (I believe common) should go to the the common post on the track transformer as part of the phasing of the transformers and the B to the switches?

That will work - it will work either way as long as you are consistent.  "C" and "F" are actually connected to the secondary wipers, which would make "A" or "B" common, depending on which voltage range(s) you are using.

Rob,

   I use a completely different transformer, where I can adjust the voltage output from the handle, I want to be able too increase the voltage when I add more switches and accessories. 

PCRR/Dave

If you need to raise the voltage when you add more, you are overtaxing the power supply.

What you really want to do is to add more current, whether in the form of a larger transformer, or more transformers.

Rob,

   If I was running low voltage switches I would use your method, with many old Lionel switches I want the ability to control the input as required, these old switches draw massive power, and in fact I use one channel of one of my ZW's to make sure they have enough power to work correctly all the time.  I have even replaced the lights with LED's in both switches and the old controllers, in this manner my switches work perfectly thru out the layout.

PCRR/Dave

Can I hook up some old Hobby Transformers directly to my system without going thru the control box that came with them. 77w 3 amp. I just want to use them to power accessories and switches. Will it hurt to leave them at full power for several hours?

That brick is really only 40 watts, and it will operate for hours just fine.

If you overload it, there is an internal fuse that will blow.  It's replaceable, just not easily.

The 77 watt rating is the power consumed from the household AC mains.