|Railroad||Miles operated in Massachusetts1|
|Class I railroads||455|
|Guilford Rail System||408|
|Providence and Worcester Railroad Company||103|
|Bay Colony Railroad Corporation||124|
|Housatonic Railroad Company, Inc.||38|
|Massachusetts Central Railroad Corporation||28|
|New England Central Railroad, Inc.||54|
|Pioneer Valley Railroad||17|
|Quincy Bay Terminal Company||4|
|Switching and terminal railroads||2|
|Grafton & Upton Railroad||2|
1Miles operated is in terms of railroad so that a mile of single track is counted the same as a mile of double track. Sidings, turnouts, yard switching mileage, and mileage not operated are excluded. Miles operated under trackage rights provided by another (owning) railroad are included.
NOTE: For definition of railroad types see previous table.
SOURCE: Association of American Railroads, Railroads and States - 2000, Washington, DC: 2002, available at http://www.aar.org/AboutTheIndustry/StateInformation.asp as of Mar. 19, 2002.