This rail signaling solution is based on the F14 single-board computer and provides the vital control functions for automatic train operation. It communicates with the trains over inductive loop channels and other wayside equipment. Three sub racks form a 2oo3 system (with a total of nine CPUs per system) with external voting.

Each rack features one main processor and two I/O processors. The CPU boards are equipped with 1GHz ULV Celeron® M 373 processors, 512MB system RAM and a 256MB CompactFlash®. The main processor computer offers the following front interfaces: A maintenance terminal, two USB interfaces, one Gigabit Ethernet and one Fast Ethernet interface. At the rear there are two PPE interfaces, one CCOT terminal, one spare interface and interprocessor communication via two LVDS reflective memory interfaces. Another feature is a halt button at the front panel.

The two I/O processors are also equipped with a maintenance terminal, two USB, one Gigabit Ethernet, one Fast Ethernet and a halt button at the front as well as two PPE interfaces, one CCOT terminal, one spare interface and interprocessor communication via two LVDS reflective memory interfaces at the rear. In addition, they offer 30 discrete inputs, 3 spare I/O lines, 16 I/O rack status lines, 16 data in lines, 5 Mux. Addr. lines, 32 data out lines and 2 interrupt lines.

Each 19" system is supplied via a PSU with a 250W power output at 50°C, an input voltage range of 90..264 VAC and four different output voltages (5V/40A, 3.3V/40A, 12V/5.5A and -12V/1.5A). The boards in the system can be operated from 0..50°C. Optionally, the system can also be equipped with a 2-slot heatsink so that it can be used from 0..60°C.