Transrail and Welado to deploy C-DAS system on Helsinki Metro August 1, 2018 | Europe Company News Sweden-based Transrail and Finland-based Welado have secured a contract from Helsinki City Transport/ Helsingin Kaupungin Liikennelaitos (HKL) to deploy a connected driver advisory system (C-DAS) on t... This content is available to only subscribers. Username or E-mail Password Remember Me Forgot Password