201307 – Strike & Crivelli – Using Axle Counters for Block Control the ARTC Experience

Utilisation of axle counters over the last two decades has been expanding to encompass many
signalling and non-signalling applications. Their uses range from simple triggering devices for
wayside equipment such as hot box detectors and weighing systems, to more complex train detection systems for train signalling.

The use of high quality fail safe (SIL4) axle counters for occupancy detection have been widely
applied in Australia for short track sections where communications are reliable and visual cues
provide an extra level of safety confidence. Life cycle costs can be substantially lower with axle counters when compared to other technologies and with advancements in technology; capital costs can also be reduced.

Longer block sections introduce an extra degree of design and procedural complexity. In the past, it has been difficult to appreciate the benefits of axle counters in these longer sections. The experience of the Australian Rail Track Corporation with small scale applications has allowed development of good operating procedures and the confidence to expand their use to block sections on the Spencer Junction to Tarcoola Line in South Australia.