Australia’s vast geography has always presented unique challenges for rail operators.
With long distances, low-density lines, and isolated regions, delivering safe and efficient train control in remote areas has historically come with less safe administrative safety controls and inefficient safeworking methods such as staff-and-ticket.
The alternatives of conventional rail vehicle detection and coloured light signalling systems were simply too expensive in those track areas.
Consequently, the decision was made to move away from administrative processes and physical infrastructure, and build a communications-based train control system that could issue vital train orders via radio, which then became the main method of safeworking until 2015.
Over the past decade that’s changed significantly, thanks to the introduction of clever software-engineered systems and processes, developed by Australian transport technology specialists 4Tel.
Now celebrating 10 years since commissioning the Electronic Authorities (EAs) functionality of the Train Management and Control System or TMACS it stands as a success story for Australian-developed rail technology. It is used to manage the New South Wales (NSW) Country Regional Network (CRN), covering approximately 2400 kilometres of rail track territory.
As a result of its reliability and simplicity for users, Electronic Authorities have become the dominant digital train control method used across thousands of kilometres of regional track, prioritising safety, efficiency and cost-effectiveness.
4Tel’s goal when creating Electronic Authorities was to shift from an administrative to an engineering-controlled process. This addressed communication issues including network control bottlenecks, and enabled train operators to accept and fulfil authorities quickly.
The design focus was to work with existing onboard equipment, digitise the control process, and create an interoperable system for all track users.
As the founder of 4Tel, Derel Wust, explained: “We made the decision to build a technology that would meet Australian conditions and allow the remote authorisation of all users on controlled tracks.
“We designed TMACS to work remotely and over any distance, while interoperating with existing onboard and other user systems of the CRN rail fleet and workforce.”
TMACS in action
The term “TMACS Electronic Authorities” describes a digital communications environment comprising structured messages, formatted data and alarms for managing track access and alerts for any track user, including trains, track vehicles and track workers.
TMACS movement authorities are managed centrally by a vital safety server, which ensures that no two users can enter the same section of track at the same time.
This “vital” function is key to TMACS’s safety credentials. Whether the user is a train driver in the cab, a track worker with a smartphone, or a network controller in a control centre, they all interact with the same central vital server for up-to-date data.
The system also features automated alarms for out-of-authority events, proximity alerts, and even a fallback voice-based train order working mode, ensuring operational continuity in degraded conditions.
According to Wust, one of TMACS’ greatest strengths is its interoperability with existing systems. Rather than requiring costly updates, TMACS transmits structured data messages that interface with existing train radios, allowing movement authorities to be issued directly to a locomotive using software alone.
“It would cost hundreds and thousands of dollars to fit out an entirely new system on a locomotive,” Wust said.
“With more than 1200 standard gauge locomotives operating across Australia, the cost of installing new hardware would be very high. We knew from the start we had to work with what was already on board.”
That same thinking extends to trackside crews. Since 2018, more than 5000 track workers and vehicles have used the 4PTW (Permit to Work) app, customised for each Rail Infrastructure Manager, which links directly to TMACS to issue and manage track access authorities via a smartphone or tablet.
These interoperable solutions mean rail operators can upgrade safety and efficiency without the high capital cost of fleet-wide hardware installs, an approach that has enabled fast deployment across New South Wales and beyond.
With the support of John Holland as the network control authority, the rollout of Electronic Authorities in 2015 was very smooth, Wust said.
“It’s through our technical innovation and John Holland’s operational innovation that together we were able to deliver this enhancement to optimise network efficiency,” he said.
“Ten years on, it has proven to be very popular and we’re very proud of the features we have been able to give train drivers and network controllers.”
TMACS is well suited to regional lines, where train movements are less frequent and the cost of traditional signalling is hard to justify.
“In regional New South Wales areas generally where TMACS operates, you rarely see red or green lights anymore,” said Wust.
“That infrastructure isn’t there because it’s no longer needed. TMACS has replaced most of it with software.”
By removing physical assets from remote areas, TMACS has significantly reduced maintenance, minimising the need to send technicians into hard-to-access locations and improving overall system uptime and reliability.
Over the past decade, Electronic Authorities have grown into a widely accepted function, with 99.9 per cent of train movement authorities on the Country Regional Network now issued digitally.
“Interest in TMACS continues to grow,” Wust added.
4Tel was recently awarded a contract to extend TMACS operations across more than 1276 kilometres of track between Tarcoola in South Australia and Kalgoorlie in Western Australia for the Australian Rail Track Corporation (ARTC).
Wust said the future of rail control lies in software-first solutions.
“The trend is clear – we’re moving off the track and into smart trains,” he said.
“Extensive trackside infrastructure is just too costly and doesn’t provide the flexibility digital systems like TMACS can offer in remote and regional areas.”
Wust said that as railways look to the next decade, TMACS stands as a model for how targeted technology, grounded in local insight and guided by local operating rules, can modernise even the most remote rail operations safely, cost-effectively, and with lasting impact.
“TMACS has become a system the industry trusts and uses every day.
“As we look at emerging technologies, like our more recent work with Artificial Intelligence, the possibilities grow even further.”
