BOSTON - Massachusetts transportation officials on April 20 unveiled plans to roll out a new fleet of 60-foot articulated low-floor diesel hybrid buses that will serve neighborhoods in Boston. 

The fleet of 25 emission-controlled, eco-friendly buses was purchased with federal stimulus funding from the American Recovery and Reinvestment Act. The buses use a hybrid system capable of improving fuel efficiency by 20 percent or greater compared to conventional diesel buses, the Massachusetts Bay Transportation Authority said. 

Additional benefits include reduced vehicle noise and improved brake life. The buses cost just over $915,000 each. This is the state's first purchase of 60-foot vehicles in five years.