Vac-Ex T-VAC 2 Solves Rail Issues

Contamination of rail ballast, the material that forms the trackbed of railway lines, is a significant problem that can affect the stability and safety of rail infrastructure. Replacing existing power and cable utilities in these environments can also be challenging. Previously, this work was often carried out using skid-mounted systems that had to travel directly on the rail, causing disruption and inconvenience.

The Challenge of Rail Ballast Contamination

Ballast contamination occurs when fine particles such as clay or silt accumulate beneath the ballast. This leads to soft spots and the formation of slurry or mud, often caused by poor drainage, heavy repetitive traffic loads, or weaknesses in the subgrade.

These conditions compromise track stability and increase maintenance requirements, particularly in high-traffic rail environments where access and downtime must be carefully managed.

A Practical Solution for Rail and Utility Works

A cost-effective solution to addressing these issues is the Vac-Ex T-VAC 2, a tracked air vacuum excavation unit designed to operate alongside rail tracks. The unit can undertake inspection, identification and service work without needing to travel on the rail itself.

Capable of excavating most types of wet or dry ground, the Vac-Ex T-VAC 2 can access sites where space is limited and is also suitable for potholing and utility exposure works.

Proven Performance on Live Rail Projects

Over the past six months, Downer’s National Projects Division has been using the Vac-Ex T-VAC 2 for railway improvements as well as local street upgrades. The unit has proven effective in both applications due to its compact footprint and ease of transport.

At just 1.77 metres wide and under 3.5 tonnes, the Vac-Ex T-VAC 2 can be legally towed on a trailer behind a ute or transported on a rail car. An onboard compressor with a twin-turbine suction system provides sufficient power to remove ballast into the large 1m³ hopper capacity.

Operator Feedback and On-Site Results

“The Vac-Ex T-VAC 2 has saved us a huge amount on subcontractor costs and is great for getting to hard-to-reach places,” says Downer’s Nick Werner, Supervisor Rail and Civils, Infrastructure Delivery, Transport & Infrastructure.

“We transport the Vac-Ex T-VAC 2 as close as possible to the site, offload it from the trailer, set it up and have it working 10 to 12 hour shifts on average. The good thing is that the machine is always there when you need it, there’s no wet spoil to dispose of, and removed ballast can be dropped at the worksite for reuse when suitable as it is not contaminated.”

According to Nick Werner, operators find the Vac-Ex T-VAC 2 simple to use and appreciate the ability to plan work without relying on subcontractors. Training sessions are conducted by YR to familiarise operators with operating procedures.

“The emphasis is on effective, efficient and safe practices,” says Nick. “Our operators have R, T and W (Rollers, Tracks and Wheels) licence endorsements, giving them a strong understanding of what’s required to safely operate track-laying vehicles in any location.”