Solaris to supply hydrogen-powered trolleybuses in Riga November 7, 2016 | Europe News Poland-based Solaris Bus & Coach (Solaris) has secured the contract to supply 10 low-floor hydrogen-powered trolleybuses to Rigas Satiksme, the public transport operator of Riga in Latvia. The contrac... This content is available to only subscribers. Username or E-mail Password Remember Me Forgot Password