In the wake of transit funding talks that stalled out on Beacon Hill and facing an unprecedented financial challenge inflicted by the COVID-19 pandemic, the MBTA plans to embark on a multiyear effort to reshape revenue sources and rein in spending — a strategy that could lead to fare hikes and/or layoffs.Leaders at the transit agency Monday projected a deficit of between $308 million and $577 million in fiscal year 2022, as well as shortfalls in at least three subsequent […]