The projected cost of bringing Boston's transit system into overall sound working order has climbed again.

Massachusetts Bay Transportation Authority officials were announcing on Monday that the system's State of Good Repair backlog was now estimated at $7.3 billion, an increase of more than $650 million from a previous estimate earlier this year.

The new figures were being offered at meeting of the MBTA Fiscal and Management Control Board, which was created last month to oversee the cash-stripped system.

The backlog is defined as the total amount it would cost to bring all assets up to ideal working order.

The T's aging infrastructure was exposed during a severe stretch of winter weather earlier this year which resulted in massive equipment breakdowns, canceled trains and stranded passengers.