BOSTON (AP) - Bostonians like to think of themselves as hardy. Last winter, their transit system was anything but.

BOSTON (AP) Bostonians like to think of themselves as hardy. Last winter, their transit system was anything but.

The Massachusetts Bay Transportation Authority is known locally as the T. It's spending more than $83 million in a race against time to winterize an aging system that was badly exposed during an unprecedented stretch of heavy snow and bone-rattling cold.

Even some of the system's harshest critics are impressed with the T's efforts to prepare for winter. They include the replacement of third-rail heaters and purchase of new snow-plowing equipment. But many experts also say it's only a temporary fix for much deeper problems.

The T's own bleak figures conservatively point to a $7.3 billion state of good repair backlog and an annual operating deficit that could top $400 million by 2020.