The train detection system had to be integrated into the mechanical interlocking that was also being restored to bring Parkend signal box back to life. Achieving the necessary ballast resistance to reliably operate track circuits would have involved relaying a large portion of track. Together with the maintenance requirements of additional track circuits, this would have been too time-consuming, as the line is operated by a volunteer workforce. Alternatively, extending the original token system would have reduced the number of income-generating services. Thus, a different method of track vacancy detection was necessary.

Based on previous positive experiences, DFR decided to go for an axle counter solution from Frauscher. To provide maximum flexibility and meet the variety of requirements defined, the Frauscher Advanced Counter FAdC was chosen. On track, nine Frauscher Wheel Sensors RSR123 are now detecting even the old steam train’s wheel flanges highly reliably. Using the system’s ability of establishing individual architectures, the axle counter was collocated with the interlocking inside the existing signal box. Track vacancy detection data is provided to be electronically integrated into the mechanical interlocking. Additionally, Supervisor Track Sections STS and Counting Head Control CHC are providing maximum availability and system resilience. The Frauscher Diagnostic System FDS provides DFR’s experts with remote access to real-time diagnostic data.