Allen H. Tweddle (1949-) is a retired railroad conductor and avid collector of railroadiana. Railroadiana are artifacts related to current or former railways. This small collection consists of photographs, prints, and note cards related to railroad locomotives. There are photographs of train stations, train cars and engines and one stereoview showing an elevated railway street scene of New York City. There is an album containing many different Amtrak trains, several blotters from the Association of American Railroads, and a few series of note cards. Notably there is a large collection of railroad locomotive trading cards from the Topps Chewing Gum Company series called "Rails and Sails" published in 1954.

A collection amassed by a retired conductor successively employed by the Pennsylvania Railroad, Penn Central, Conrail and Amtrak. It consists partly of company publications and documents collected on the job, and partly of advertisements, timetables, brochures, maps and other railroadiana from many different companies bought from dealers and other collectors. It is particularly useful for the Amtrak manuals relating to things like consumer satisfaction, employee health and safety and equipment maintenance.