PRINTED circuit board (PCB) assemblies from St Ives will play a key role in railway signalling equipment for a rapid transit system being built to support the 2010 football World Cup in South Africa. Contract electronics manufacturing services provider Prism Electronics Limited has supplied 400 PCBs to ERB South Africa, which is manufacturing signalling equipment for the Gautrain Rapid Rail Link project between capital Pretoria and Johannesburg. Construction of the link - one of the largest rail engineering projects of its kind in the world - began in 2007, and it is set for completion in time for the start of the FIFA World Cup in 2010. Originally conceived to ease traffic congestion in South Africa's economic hub, Gautrain will link Pretoria in the north with Johannesburg's Park Station in the south of the corridor in Gauteng Province. There will also be a link to OR Tambo International Airport, which serves both Pretoria and Johannesburg. Stadia in both cities will be playing host to fixtures in the 2010 World Cup, so Gautrain will play an important part in getting soccer fans to and from the airport as well as between venues. Prism was selected to supply PCBs for the project because it is already a trusted supplier for other projects in the rail signalling sector, a company spokesman said. David Dickin, business development director, added: "It is pleasing to see our trusted business relationships with customers paying dividends. Word of mouth is perhaps the most effective form of advertising, and we are delighted to be working with ERB to help deliver this project." The tested PCB assemblies are essential to the 'brains' of the Gautrain rail control signalling equipment. The equipment comprises receivers, incorporating Prism assemblies, and transmitters fitted to rail track and to trains.