How to wire O Gauge Uncoupling/Operating track through OTC using accessory power?

Take the third controller wire("power") off the track binding post and connect it to your fixed voltage source that shares a common with the track. Leave the third post/screw empty, or connect track power to 3 & 1(hot & common, respectively) for an additional power drop / connection.

Wow.  Thanks Rob.  I will try it.

Rob,

Does this allow for the coil to fire independently?  Aux 1 magnetic uncouple, Aux 2 rails?

https://www.youtube.com/watch?v=lAwKCInQVeo

Yes, Using this diagram will leave the OTC functioning as designed, but the track can be used while the train is powered down.

Can I use an ASC2 to run uncoupling track?

Yes, Adam ND. The ASC2 will run up to eight uncoupling tracks; you will want to use the single-addressing mode. See the instructions for details.

Here are two ideas for Fastrack Operating Tracks with an ASC2 if anyone is interested.

First: Lionel's website has a document in the support section that is a wiring diagram for running a Fastrack Operating Track.

Second: There is a fantastic Youtube video by a guy named Sean. His channel is called "Sean's Trains, Cars, and Other Stuff." He has a video on the channel called "My O Gauge Layout-Episode 5-Part 2." In the video, Sean shows how to setup and use the ASC2. He has a short segment at the end of the video that shows how he modified a Fastrack OT to work with the ASC2.