DCS and Conventional on Same Track

2 single pole switches but if you do this you need the switches with the flip up safety covers like they use in race cars that way A) you'll have to purposely flip up the cover to turn each switch on.
B) You won't inadvertently bump a switch and turn them both on .
Most auto parts sell them.

David

It seams like a lot of work for nothing. Simply connect the output of your transformer to the input of the TIU and run the output of the TIU to the track. Power the TIU from the AUX input. Now what ever you feed into the TIU you will get on the output. This will run your conventional engines the same as always. If you want to run a DCS engine simply turn the power up on the transformer. If you want to control your conventional engines using the DCS remote then use the Variable 1 and 2 input/output chanels on the TIU. No muss or fuss with switches.

Al

One point to add to Al's post.

Park the DCS engines on a siding and cut the power to that siding so they don't decide to play conventional and run along with the engine you intended to run.

Now, I would put a relay at the siding and control it with my AIU or a lighted toggle switch, but it's your call there. You can always just remove them from the layout too.

I just did that a few weeks ago.

Bridged Fixed 1 and Variable 1 on the input side, ran wires from both outputs to the outer posts of a DPDT switch, and wire the center posts to the track. 

Both outputs are active at all times, but only the output the switch is thrown to is connected to the track. I also have three sidings with kill switches (also powered off the output side of the switch) for parking locomotives.

---PCJ

I ran the power through the variable TIU and it seems like my proto 1 guts got cooked. It only works so-so now vs. the smooth operator it was prior to adding the TIU.

*sigh*

I run my conventional PW and proto 1 via the variable. I can't imagine what would have "cooked" your ps1?

Greg