21. Bowie Tower was used until 1986, when the signal and interlocking system on the line was computerized. 22. An interlocking system was installed in 1924. 23. In Feb 2012 two new platforms were added to the Ranchi station along with mechanical interlocking system . 24. From 1932 to 1934 there was an electro-mechanical interlocking system of class VES 1912 with four interlockings. 25. LockTrac 6131 ELEKTRA is an electronic interlocking system that provides the highest levels of safety and availability. 26. The National Rail Administration has started a plan to replace the existing interlocking systems with an ERTMS-compatible system. 27. The station is equipped with Standard III interlocking System with Multiple aspect Color light Signals and mechanical points. 28. Early interlocking systems used mechanical devices both to operate the signalling appliances and to ensure their safe operation. 29. But in modern Europe, with its interlocking system of entitlements, protecting one man's good life can threaten another's. 30. In the course of restructuring the entire Weinheim Heidelberg route was equipped with a new electronic interlocking system .
