REGISTER

P.N. Scottney-Turbill

Train Services Superintendent State Transport Authority South Australia

Following the State Transport Authority's acceptance of its Consultant's recommendation to install British type, three aspect colour light route signals in the Adelaide metropolitan area, it was necessary to identify any problems in introducing what appeared to be a radical departure from the existing speed signalling system.

Firstly, A.F.U.L.E. representatives were given a demonstration of the physical characteristics of the new style of signal and the aspects to be displayed and, in general terms, there were found acceptable. Following comments from the A.F.U.LE. some modifications were made.

Some of the major factors which were considered when developing Operating Rules to apply to the new Signalling system were:

• Australian National trains use State Transport Authority lines.
• State Transport Authority trains use Australian National lines.
• Australian National's signalling system uses speed indications only.
• Australian National crews work on State Transport Authority trains on a made available basis, and the interchange between the two organizations.
• During the construction and comissioning stages there will be a mixture of both signalling systems in the metropolitan area.
• The system should give a simple clear signal indications.
• There should be no degradation of safety nor reduction in flexibility.