San Diego MTS contracts STV for TPSS, US July 17, 2024 | Company News, News, North America Company News, North America News The San Diego Metropolitan Transit System (SDMTS or MTS) has awarded a contract to STV for the replacement of five traction power substations (TPSSs) to power the 104-km-long electric light rail trans... This content is available to only subscribers. Username or E-mail Password Remember Me Forgot Password