Valley Flyer trains also offer the same connecting service at New Haven, but continue past Springfield north to Greenfield, Massachusetts.

[8] As New Haven was the northern limit of electrification on the Northeast Corridor, New York–Boston trains changed between electric and diesel locomotives at the station.

Until August 2015, daily service in each direction on the Springfield Line consisted of four Shuttles, the Vermonter, and one or two Northeast Regional trains.

[13] Between August 3, 2015 and December 31, 2017, several round trips on weekdays were replaced by buses to accommodate double track construction for the ConnDOT Hartford Line commuter rail service.

[14] On June 9, 2018, three additional weekday Shuttle round trips were added as part of the startup of Hartford Line service.

[17] On September 10, 2018, as part of a schedule change made to Hartford Line trains, all Amtrak Shuttles and Northeast Regionals started stopping at New Haven's State Street station.

Amtrak adopted the Hartford Line name for use on the trains it operates on the corridor and retired the Shuttle designation in September 2019.

[21] On June 12, 2018, Massachusetts Governor Charlie Baker announced that two daily round trips would be extended to Greenfield in 2019 as a pilot program.

Two round trips are offered on weekdays and one on weekends with southbound trains in the morning and northbound in the evening which complement Amtrak's existing daily service on the Vermonter.

[19] Typical consists run in push-pull configuration with a General Electric P42DC locomotive pulling an Amfleet coach and a 9600-series ex-Metroliner cab car.

Southbound Valley Flyer trains require an equipment move from the crew base and equipment layover yard at Springfield Union Station to the Olver Transit Center in Greenfield prior to the Greenfield departure as Amtrak does not have any crew or turnaround facilities in the area.

Likewise, equipment and crews on northbound trips must dead head back to Springfield after unloading all Greenfield passengers.

Another unique operational aspect of the Valley Flyer is the need for the push pull trains to reverse directions twice at Springfield during the trip due to the station’s location just to the east of the intersection between the Amtrak Springfield Line, MassDOT Connecticut River Line, and CSX Berkshire Subdivision.

[26] Vermonter trains on the corridor do not accept CTrail tickets, and are subject to standard Amtrak fares and reservations policies.