Running Signal Bridges and Block Signals From Track Power?

I created this insulated rail signal driver for various scenarios, including all powered from the track.  You can get them from Henning's Trains:  Insulated Track Signal Driver, Rev. 2

Here's the documentation package for the board: Insulated Rail Signal Driver Rev. 2 Documentation.pdf

Here's a diagram from the above documentation link for driving the signal and board all from track power.

OK, thanks!  That looks like it would do what I want.  It also takes the place of the contactor plate associated with signals, which I also like.

Yep, the 153 Contractor is a bit finicky sometimes, this works 100% positively with an insulated rail.  This unit also has DCS signal protection for it's internal circuitry so it won't affect DCS locomotives.