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|Horsecar systems||Bridgeport Horse Railway Company East Hartford & Glastonbury Horse Railroad Hartford & Wethersfield Horse Railroad Company Meriden Horse Railroad Company New Haven & West Haven Horse Railroad New London Horse Railway Company Norwalk Horse Railroad Company Stamford Horse Railroad Company State Street Horse Railroad Company Waterbury Horse Railroad Company|
|Streetcar systems||Branford Lighting & Water Company Bridgeport Railway Company Bridgeport Traction Company Central Railway & Electric Co. Cheshire Street Railway Connecticut Electric Company Connecticut Light & Power Company Consolidated Railway Company Derby & Ansonia Street Railroad Company Derby Street Railway East End Railway Company Edgewood Avenue Electric Company Edgewood Street Railroad Company Fair Haven & Westville Railroad Farmington Street Railway Greenwich Tramway Company Groton & Stonington Street Railway Groton & Stonington Traction Company Hartford & West Hartford Railroad Hartford Manchester & Rockville Tramway Company Hartford Street Railway Lake Saltonstall Railroad Company Meriden Electric Railroad Meriden Southington & Compounce Tramway Company Middletown Street Railway Milford Street Railway Montville Street Railway New Haven & Centreville Street Railway New Haven & Morris Cove Railway Company New Haven & Shore Line Railway, Incorporated New Haven Street Railway New London Street Railway Norwalk Street Railway Norwalk Tramway Company Norwich Street Railway Peoples Tramway Company Portland Street Railway Company Putnam & Thompson Street Railway Company Shelton Street Railway Shore Line Electric Railway Company South Manchester Light Power & Tramway Company Stamford Street Railroad Suffield Street Railway Thompson Tramway Co. Torrington & Winchester Street Railway Waterbury Traction Company Westport & Saugatuck Street Railway West Shore Railway Co. Whitney Avenue Railroad Company Willimantic Traction Company Winchester Avenue Railroad Worcester & Connecticut Eastern Railway Company|
|Bus systems||Bridgeport Auto Transit Company Candlewood Bus Company Chestnut Hill Bus Corporation Chieppo Bus Company City Bus Line Cross Country Coach, Inc. Danbury Power & Transportation Company Gray Line Bus Company H & W Transit Company Joseph H. McMahon Company Orange Street Bus Line Savin Transit Company Stratford Bus Line Company Thames Valley Transit, Incorporated Valley Transportation Company|
|Streetcar/Bus systems||The Connecticut Company Connecticut Railway & Lighting Company Danbury and Bethel Street Railway Danbury and Bethel Traction Company|