Proterra to supply two electric buses to MetroLINK, Illinois August 26, 2016 | North America News Proterra has secured the contract to supply two 40-foot (12-metre) long Proterra XR electric buses to the Illinois Quad Cities' MetroLINK transit organisation by 2017. MetroLINK has an annual ridershi... This content is available to only subscribers. Username or E-mail Password Remember Me Forgot Password