Web of wires to the 8 channel relay board that controls track power and turnouts

Arduino board connected to the line trace modules for train detection, and the LCD panel status display

8 channel relay board all wired up under the yard

Arduino, relay board and line trace modules all installed under the departure end of the yard

Rat's nest of random wires used to connect the Arduino board to the LCD panel via the 4-bit interface

Rat's nest of random wires used to connect the Arduino board to the LCD panel via the 4-bit interface

Long cable connects points at arrival end to relay board at the departure end that throws the Kato point motors

Underside view of the arrival end of the yard - wires for power feeders, plus for powering point motors

Top view of a 'Arduino Line Trace Module' for train detection installed under Kato Unitrack

Top view of a 'Arduino Line Trace Module' for train detection installed under Kato Unitrack

Under layout view of a 'Arduino Line Trace Module' for train detection installed under Kato Unitrack

Under layout view of a 'Arduino Line Trace Module' for train detection installed under Kato Unitrack

Fitting out the underside of the yard - 'Arduino Line Trace Module' for train detection, plus wires for track power feeders, and for throwing the point motors

Holes cut between the rails of Kato Unitrack so the 'Arduino Line Trace Module' can be used for train detection

'Arduino Line Trace Module' modified to put the trimpot facing the underside of the layout, so it fits under the track

'Arduino Line Trace Module' modified to put the trimpot facing the underside of the layout, so it fits under the track

Using 0.1" DuPont connectors to connect to Kato #4 turnouts lacking the factory supplied wires

Using 0.1" DuPont connectors to connect to Kato #4 turnouts lacking the factory supplied wires

Home made feeder wires for Kato Unitrack

Six module long T-Trak layout