One of the features I want to add to my new Euro themed Unitram layout is automatic blocks at a central plaza.
Simple automatic blocks can be created with off-the-shelf, plug-and-play Kato components. On the selected track piece, I replaced the normal Unitram Unijoiners with the black 24-816 Insulated Unijoiners and added a 44-847 Tram Feeder Power Cable under the selected track piece. The feeder is plugged into a 24-850 Kato Power Feed Control Switch which clips onto the side of a Kato power controller just like a Switch Selector. When the power switch is turned OFF the car always stops at the selected location. When the power switch is turned ON the car continues on through the block or if stopped already begins running.
The 24-850 Kato Power Feed Control is then plugged into a Kato 24-827 3-Way Extension Cord, along with two other feeders on this particular track loop and plugged into the Kato Controller power feed.

Simple block control can be set up with off the shelf Kato components.
I plan to have a junction with trams coming into a station from four directions like many the tram stops at many European train stations. Two blocks are installed now before the intersection and two more will installed later at the actual tram stop.
With this automatic block system, the operators function is more like that of a tower operator. Throw the turnout switch and set the block to proceed and the tram moves on along the line.