is there any memorabilia of the trains kept?
Yes
Rogers Locomotive and Machine Works
The following locomotives (in serial number order) built by Rogers, before ALCO's acquisition of the company, have been preserved. 
who started rogers locomotive and machine works? Thomas Rogers, Morris Ketchum and Jasper Grosvenor. when? 1832 where was this company started? 1856 does the company still exist? No do you know when it closed down? 1920s why did it close down? Stiff competition and an inability to increase its own capacity. did another company take over or merge with them? ALCO purchased it but sold off later, now the building is home of Paterson Museum. where is the museum located? Paterson, in Passaic County, New Jersey. what items are kept in here? Fenian Ram, archive of Holland's life and work, etc.
wiki:20644274
Rogers Locomotive and Machine Works [SEP] Preserved Rogers locomotives
The following locomotives (in serial number order) built by Rogers, before ALCO's acquisition of the company, have been preserved. Where multiple railroads and road numbers are listed, they are given in chronological order for the locomotives; all locations are in the United States unless noted.