had used a fixed-block, three-position signalling system designed for lower frequencies and less services. However, the ageing system had undermined reliability due to the presence of system faults and limited frequencies, requiring the Cranbourne, Pakenham, and Sunbury lines to upgrade their signalling system. Since 2021, high-capacity signalling (HCS) has been rolling out on the Pakenham, Cranbourne, and Sunbury lines, allowing trains to safely run closer together and run more frequently. The new system is being delivered by CPB Contractors and Bombardier Transportation under the Rail Systems Alliance. These works valued at $1 billion includes the roll-out of of HCS and communications systems on the aforementioned lines, allowing an increase in reliability and frequency. The line will be equipped with Bombardier’s CityFlo 650 communications-based train control system, which will enable operation at 2–3 minute headways. The upgrade works were completed in phases from 2021. With the upgraded signalling system, trains are now able to run closer to each other. The new system was tested on the Mernda line and a section of the Cranbourne line before being fully implemented. In March 2022, the Cranbourne line underwent further testing of high-tech signalling equipment, to ensure the new trains and signalling system can safely run alongside older-generation trains—including freight and V/Line trains—and the existing signalling system. References External links Cranbourne line timetable Network map Railway lines in Melbourne Railway lines opened in 1886 1886 establishments in Australia Public transport routes in the City of Melbourne (LGA) Transport in the City of Yarra Transport in the City of Stonnington Transport in the City of Glen Eira Transport in the City of Monash Transport in the City of Kingston (Victoria) Transport in the City of Greater Dandenong Transport in the City of Casey