Connecticut:

 Connecticut Eastern Railroad Museum (Willimantic, CT)

 Connecticut Trolley Museum (East Windsor, CT) 

https://www.danburyrail.org/     

      Essex Steam Train (A/K/A Valley Railroad) (Essex, CT)

      Naugatuck Railroad and Railroad Museum of New England (Thomaston, CT)

      Peters Rail Road Museum (Wallingford, CT)

      The Shore Line Trolley Museum (East Haven, CT)

      Western Connecticut NRHS Chapter (South Norwalk, CT)

New Jersey:

      Black River & Western Railroad (Flemington, NJ)

      New Jersey Transit - unofficial site

      West Jersey Chapter, NRHS

      Whippany Railway Museum, Inc. (Whippany, NJ)

New York:

      The Railroad Museum of Long Island

      Long Island Rail Road History -- unofficial website

      New York City Subways - unofficial site

      Poughkeepsie RR Bridge

General USA:

All About The Street Car, Trolley and Subways | TitleMax

A Brief History of the Texas Railroads (austinrealestate.com)