BOSTON — The Massachusetts Bay Transportation Authority has announced a significant number of service disruptions in April for track work to address speed restrictions on its rail rapid transit network, as well as some commuter rail work. According to an MBTA press release, the Red Line is scheduled for the most work, with five scheduled service outages. — Between the Park Street and JFK/UMass stations beginning at approximately 9 p.m. April 18-20, to prepare for upcoming weekend work. — Orange and Green Line service in downtown Boston will be disrupted by demolition of a parking garage April 1-2 and April 8. The Haverhill commuter line will see trains replaced with shuttle buses for 16 days, April 22-May 7, for Automated Train Control Work.