NEW : California Public Utilities Commission passed ban Thursday . Phone records show engineer texting during work hours on day of crash . Engineer Robert Sanchez was among 25 people killed in Friday 's crash . Comment:
NEW : California Public Utilities Commission passed ban Thursday . Phone records show engineer texting during work hours on day of crash . Engineer Robert Sanchez was among 25 people killed in Friday 's crash . Investigators determined the brakes on train he was driving were not applied .