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