Ridership on the MBTA increased by 1.5 percent to nearly 1.4 million passenger trips per weekday in September 2012, compared with the same period a year ago, the T announced today.

It was the second consecutive monthly increase, a surprising figure to MBTA analysts who expected a 5.5 percent decrease in passenger trips after fare increases were implemented in July.

The MBTA reported ridership increases in September of 2.3 percent on buses and 3 percent on subways. The Green Line saw a decrease of 1.2 percent. Weekday commuter rail ridership also slipped slightly, by 0.2 percent, the MBTA said. Ridership for The RIDE paratransit service decreased by 15.2 percent, the T said.

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Acting General Manager Jonathan Davis said numbers may have been boosted by schools being back in session.