The Electric Trap is a buildable equipment in TranZit. The parts required to build it are the car battery, metal plate, and TV glass, all of which are found in the room above the Power Switch. It is built on the construction table next to the stairs and requires a turbine to power it. It will shock zombies that come near it and instantly kill them until Round 55. It is not effective against the Avogadro, however.
The Electric Trap ready on the construction table.