The buses, transit and subways are usually use all city. Boston city buses are operated by the MBTA. The MBTA is transportation authority for Greater Boston. Visitor can see the sights in Boston; find you walking or taking Boston taxis, the Boston subway or Boston Commuter Rail trains. For the major sights of Boston usually use rail transport lesser than buses.  Boston city has four subway train lines. The Massachusetts Bay Transportation Authority (MBTA) operates thirteen Commuter Rail lines connecting Boston. Visitors to Boston  find the Red Lines buses and Green Line buses most useful for seeing the sights. The Blue Line buses and Silver Line buses are useful for Logan Airport. Red Line buses are useful for travel between Center, Downtown Crossing, Park Street and Square. Green Line buses goes from Lechmere Square near the Museum of Science in East Cambridge through Park Street Station and central Boston, to Copley Square, after which it splits into four lines. Blue Line buses connects downtown Boston , with the Airport station at Logan International Airport. The Blue Line to reach the New England Aquarium. Silver Line buses are a limited-access bus line, connecting South Station Transportation Center with Logan Airport, Boston's World Trade Center, Boston Industrial Park and City Point. Boston subways are usually use for many routes to travel for residents, visitors and tourists. Boston taxi are usually use for tourists. Boston rail is also move all over the city.