This is a list of all freight railroad (not streetcar or rapid transit) lines that have been built in Massachusetts, and does not deal with ownership changes from one company to another. The lines are named by the first company to build or consolidate them.
These railroads were owned by or closely related to the Boston and Albany Railroad, later part of the New York Central Railroad.
These railroads were owned by or closely related to the Boston and Maine Railroad.
The Connecticut River Division was the former Connecticut River Railroad.
The Eastern Division was the former Eastern Railroad.
The Fitchburg Division was the former Fitchburg Railroad.
The Southern Division was the former Boston and Lowell Railroad.
The Western Division was the original Boston and Maine Railroad.
The Worcester, Nashua and Portland Division was the former Worcester, Nashua and Rochester Railroad.
These railroads were owned by or closely related to the Central Vermont Railroad.
These railroads were owned by or closely related to the New York, New Haven and Hartford Railroad.
The Berkshire Division was the former Berkshire Railroad.
The Central New England Division was the former Central New England Railway.
The Hartford Division was the former Hartford and New Haven Railroad.
The Midland Division was the former New England Railroad.
The Northampton Division was the former New Haven and Northampton Company.
The Old Colony Division was the former Old Colony Railroad.
The Providence and Worcester Division was the former Providence and Worcester Railroad.