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Keolis Commuter Services, operator of the Massachusetts Bay Transportation Authority's (MBTA) commuter-rail system, logged an on-time performance rate of 92.4 percent in December 2015.

The figure marks the best on-time performance last year, Keolis officials said in a  press release.

When adjusted for delays beyond Keolis' control, such as trespassers or police activity, December's on-time performance rate was 95.5 percent. December is typically a challenge month because of the transition between falling leaves, falling temperatures and winter's first snow, Keolis officials said.

The numbers show that the service improvement agreement between MBTA and Keolis is producing positive results, said Keolis Commuter services General Manager Gerald Francis.

In August 2015, Keolis developed a service improvement plan for the last five months of 2015 that set performance benchmarks for commuter-rail service in areas of on-time performance, fare collection, staffing levels and locomotive availability. By year's end, Keolis had met or exceeded those goals, company officials said.

Additionally, between July and December last year, the number of late trains on the commuter-rail system decreased by 25 percent when compared with the average for that period over the last decade.