T changes course on fare system upgrade
New phased-in approach has costs and benefits
By 
HAVING MISCALCULATED THE needs of its riders and the capabilities of its vendor, the MBTA has adopted a new approach to overhauling its fare collection system that will take longer to complete, cost more, but result in a better and more reliable product, officials say. Rather than the all-at-once, make-or-break transition dubbed a “big bang”(...)