Variances Standards Board To Allow Metrorail Project To Use Propane In Tunnel By: Kevin Thompson Vol: 35 | No: 36 | Published on: September 29, 2008 Metrorail project contractor's hazard-control procedures allow safe use of volatile gas, Cal/OSHA finds.Read More...This content is for premium subscribers. To read please login or subscribe below.Subscribe Log In Username or Email Address Password Remember Me