Since its commissioning, the PLC interlocking has been working reliably and without failures. The next project has already started: In 2014, Movares installed a second PLC interlocking with COTS components from HIMA for ProRail at the Beverwijk railway station. This interlocking has been in operation since April 2015.
Interlocking systems prevent collisions between trains, derailments, and collisions between trains and vehicles at level crossings and is critical to keep railways safe. Eurolocking is a SIL4 approved interlocking based on commercial of the shelf parts (COTS).
Current interlocking systems consist of specially designed safety computers or complex systems consisting entirely of what are called B relays. B relays are extremely safe, but they are also rather dated and they do have technical limitations. Safety computers are comparatively expensive, as they can only be used for a narrow range of applications.
The first Interlocking system came into service in July 2012, at Santpoort Noord Yard. This was the first COTS based SIL4 PLC Interlocking on a main line in the Netherlands and the first in the world. In December 2012,
ProRail approved PLC Interlocking for use throughout the Netherlands, paving the way for worldwide utilization of the system. In September 2021 there are over 12 Eurolocking system in service on the main line of the ProRail infrastructure network.