1/ Frustrated and stuck on the @MBTA? Here’s a thread for your morning commute, and a reminder of why the transit system’s main funding source has fallen far short of expectations: 2/ The @MBTA has relied on the “penny on the sales tax” since 2001. At the time, the state thought sales tax revenue would continue to grow by 3 to 8% per year as it had. In 2007, 3% was still “worst case scenario”.