Article snapshot taken from Wikipedia with creative commons attribution-sharealike license.
Give it a read and then ask your questions in the chat.
We can research this topic together.
The Hartford Line runs between New Haven Union Station in New Haven, Connecticut and Springfield Union Station in Springfield, Massachusetts, running through Hartford, Connecticut. This line is a joint venture between the Connecticut Department of Transportation and the Massachusetts Department of Transportation (MassDOT). The line is not electrified and is a single track route that uses diesel locomotives. Service began on June 16, 2018. CT Rail Hartford Line tickets are also accepted on the Amtrak Hartford Line, however, the Vermonter inter-city service does not participate despite running along the same route. The majority of the Hartford Line's route is along the New Haven–Springfield Line, with two stations in New Haven, Union Station and State Street, being on the Northeast Corridor.
CT Rail's Shore Line East commuter rail service runs between New London and New Haven. When service initially started along the line on May 29, 1990, CT Rail commuter trains were intended to be a temporary measure in order to reduce congestion along Interstate 95 during a highway construction project. However, the service was made permanent due to more ridership than initially anticipated. The line has an average daily ridership of about 2,100 riders and runs along the Northeast Corridor for its entire length. Since May 2022, Shore Line East has used Kawasaki M8 electric multiple units to provide service on the line.
In August 2023, CTDOT approved a $315 million contract with Alstom for 60 single-level passenger cars. The cars will replace the existing coach fleet on the Hartford Line along with the Metro-North Waterbury Branch and Danbury Branch. Deliveries are expected to begin in 2026.