In 1962 a pioneering solid state interlocking was installed on the branch.
2.
In 1991, Rugby PSB took over control of the Northampton area using Solid State Interlocking ( SSI ).
3.
The new Solid State Interlocking was commissioned in 1989, and was the first fully computerised system in Melbourne.
4.
With the new system, signals and interlockings are still absolutely required, their job being done better by relay interlockings or Solid State Interlocking controllers.
5.
The new system had solid state interlocking, but far fewer signals; as a consequence the maximum traffic capacity of the line was severely reduced.
6.
Mechanical signalling along the line to Essendon was abolished in 1965, but it was not until 2000, that a Westrace solid state interlocking was provided.
7.
The system uses BR Mark 3 solid state interlockings, predominantly four-aspect signals and a combination of Smiths clamp-lock and GEC-Alsthom HW2000 point machines.
8.
Away from complex terminals unit lever control systems remained popular until the 1980s when solid state interlocking and control systems began to replace the older relay plants of all types.
9.
Proper interlocking of the signals and point work did not exist until 1981, and the station was not fully interlocked until 1998, when a Solid State Interlocking was provided.
10.
The main contractor for the work was GEC Alsthom which provided a Mark 3 Solid State Interlocking ( SSI ) system, with SEMA providing the IECC element at Upminster that replaced all signal boxes on the whole line.
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