Softil’s award-winning BEEHD software development kit was chosen by Hoimyung Corporation, whose line of business includes the wholesale distribution of miscellaneous industrial supplies.

It will be used to construct "next generation 3GPP MCPTT standard compliant mission-critical push-to-talk communication terminals".

"South Korea’s new hi-speed rail link brings together some of the most advanced technologies available today," Kelvin Soh, chief technology officer of Hoimyung ICT, said.

"Our decision to use Softil’s BEEHD technology to build next generation communication terminals was very simple…nothing else comes close."

Pierre Hagendorf, Softil’s chief executive, added: "Softil’s mission is helping the world to better communicate and interact.

"We’re proud that our BEEHD technology will be at the heart of the Pyeongchang 2018 Winter Games and beyond."

Hoimyung will build the terminals using Long Term Evolution-Railway (LTE-R) technology, a version of LTE specifically for the mission-critical operational and maintenance services of railway operators.

The BEEHD framework is LTE-R compatible and will enable Hoimyung’s Train Radio Communication System terminals to deliver stable voice calls, video calls and data communications on trains running at speeds in excess of 250 kilometres per hour.

It also provides tracking train information and railroad guide to the engine driver.

The high-speed railway was a key part of the successful bid in 2011 from Pyeongchang 2018, but it has been hit by repeated delays.

Testing is currently continuing with trains not due to begin running on the line until December.

Once the high-speed railway line linking Seoul and Gangneung opens, it is hoped that this will reduce journey times to 1 hour 15min.

A journey from Incheon International Airport to the Olympic sites should be completed in two hours.