The MBTA announced today that a $10 weekend pass - good for unlimited travel on commuter-rail lines on a Saturday and Sunday, will be extended through Dec. 9.

The T had run the fare during the summer as a pilot to see if the fare would increase weekend ridership on the diesel-powered trains to and from North and South stations.

During the pilot, initial indications have been highly promising. Pass sales have steadily grown from the pilot’s first weekend of June 9-10 in which 3,470 passes were sold to over 8,100 passes sold during the most traveled weekend of July 28-29. While the MBTA has received strong positive feedback from customers using the $10 weekend pass, the MBTA recognizes that, due to weekend track work that took place related to the Positive Train Control project, some customers were unable to take advantage of the weekend fare pilot when certain Commuter Rail lines were shut down on weekends this summer.

The fare is for passengers 12 and older. Adults can bring two children under 12 with them for free.