Middlemount Balloon Loop
|Client:||Middlemount Early Rail Alliance (GHD and John Holland Group)|
|Duration of works:||2010 - 2012|
|Location:||Middlemount, Queensland, Australia|
- Delivered signalling circuits, data design, principles testing, and onsite testing and commissioning for a new 17 kilometre balloon loop track.
- Signalling works included two new Microlok interlockings contained within two standard Queensland Rail (Aurizon) style Signalling Equipment Rooms (SER).
- Upgraded an axle counter block to the newer Siemens counter, and modified another to an ML track circuit block.
The key challenges of the project were:
Due to the reduced length of the Middlemount Junction to Bundoora block, a distant signal was unable to be positioned at braking from the signal protecting the junction. This required starter signals to be upgraded to have a Yellow aspect, with the interfacing and aspect sequencing fed via a copper cable from a new SER. Dual telemetry links were designed into the SER, with a single telemetry link designed into a second new SER using fibre.