The APC's receiver protects the train power supply when travelling through neutral sections in the overhead line. The receiver interacts with magnets placed outside the track at the beginning and end of the neutral zone. Traditionally, the APC receiver was not solid state and worked using relays, which are now obsolete. Unipart Rail's ability to look at existing products and improve them interested Transportations Systems. The initial product discussions focussed on AWS developments, in particular how Unipart Rail had taken the non-electronic version and produced a successful solid-state version ,now used throughout the world by train operators.

Voltage Transformers are transformers which convert high voltages into measurable and standardized voltages. These are then proportional and in-phased to the primary signal. Voltage Transformers have only one magnetic iron core with an attached secondary winding(s). Voltage Transformers can be provided either as single pole or double pole insulated designs.

Current Transformers are transformers which convert high currents into measurable and standardized currents. These are then proportional and in-phased to the primary signal. window type current transformers with cast resin insulation for the use as high or return current transformers in or on top electrically powered rail cars.