Additional bus companies, listed as existing during additional years or decades, are mentioned in old City Directories, and in the WPA American Guide Series of state guidebooks.
Corbin Avenue Bus Service - city service in New Britain, existed in 1930's to 1960's.
East Street Bus Line - city service in New Britain, existed in 1930's to 1960's.
Mastco Bus Line - city service in New Britain, existed in 1920's to 1960's.