Metro station (Robert Thomson/The Washington Post)

Metro said revenue from its bus and rail operations are down for the third quarter of fiscal 2013.

The transit agency’s chief financial officer is expected to give an update Thursday to the board’s finance committee.

Metro’s year-to-date operating revenue of $620.7 million is $21 million below budget, according to a financial presentation that will be made to the board and that is on Metro’s Web site.

About $6 million of the shortfall is because the federal Christmas Eve holiday fell on a weekday last year and from a loss of business during Hurricane Sandy when the system had to shut down temporarily to deal with the storm.

For the year, Metro’s revenue for its rail, bus and parking facilities is down.

Rail revenue is $16 million below budget for the year. Parking revenue is $2.3 million under, and bus revenue is $1.2 million under budget. MetroAccess, the door-to-door shuttle service for disabled riders, is $300,000 above budget.

In the financial report, Metro said overtime for the third quarter was over budget by $3.2 million or 22 percent. In the first quarter, overtime was $9.2 million over budget.

Metro has said much of its overtime budget has been spent on doing weekend track work to fix the aging and deteriorating rail system.