In the past a single "Northeast Regional" round trip (usually trains 142 and 145) would travel between New Haven and Boston via the so-called "Inland Route" via Springfield and the Boston Line, as opposed to the faster, electrified Northeast Corridor. In 2003, a problem pulled the "Acela Express" trainsets out of service and in an effort to find substitute rolling stock, Amtrak first curtailed the inland round trip to a three-car shuttle between Boston and New Haven before canceling it completely. Today, all normally scheduled "Regional" trains using the Inland Route only use the portion between Springfield and New Haven; in the event of a service disruption on the Northeast Corridor, trains may be scheduled to run via the complete Inland Route. One such occasion was the replacement of the Thames River Bridge movable span in June 2008, when Amtrak scheduled three round trips per day over the Inland Route to substitute for the complete suspension of regular Northeast Corridor service.