The next generation of train protection warning systems.

Designed to comply, perform, monitor and integrate.

Designed to Comply


Our engineers have designed the system to fully comply with GE/RT8030 Issue 4 and GE/RT8075 Issue 2.

These updated standards require all new vehicles built or undertaking significant overhaul (after 1st December 2012) to be compliant by being

fitted with TPWSfour© with its new levels of safety.

The TPWSfour© system incorporates the requirements for modification

to the in-cab TPWS panel (DMI) to provide separate information on the occurrence of an AWS, OSS and SPAD TPWS intervention.

Designed to Perform


We’ve designed TPWSfour© to integrate with both driver and machine. The system’s enhanced capabilities ensure that brakes are only released after the correct delay and ensure that the likelihood of an inadvertent over-ride (reset and continue) is eliminated and to prompt the driver to contact the signaller.

The factory selected variable audibility approach ensures that the tones and voice systems are 10dBA above ambient (levels required to be confirmed by the customer), in the range of 65dBA to greater than 90dBA, avoiding driver discomfort.

The new spoken warnings are a piece of clear and unambiguous advice to the driver to further eliminate SPAD potential.

‘Antifuse Link Logic’ is utilised in our system, using field-programmable gate arrays. This system design principle is more inherently reliable than software-based systems, reducing the potential of unexpected system functionality activation compared to software controlled systems.

Designed to Monitor

The in-built data monitoring and recording systems ensure:

Designed to Integrate


TPWSfour© control units are designed to fit in the same space envelope as the existing TPWS system – reducing the headache of finding additional space for system components.

ETCS compatibility is built into TPWSfour© to ensure future developments and upgrades can be accommodated without further system developments or performance impacts.

Integration, performance, monitoring and compliance come together in TPWSfour© to give you the system you need to enhance safety and performance on your vehicles.