HOseeker is an independent reference and resource website for people who collect, identify, repair, or trade model trains, with a focus on HO scale. Its literature section provides assembly diagrams and parts information for engines and rolling stock from manufacturers including Athearn, Bachmann, Bowser, Kato, Mantua, Tyco, Rivarossi, and many others. Visitors can also consult catalogs, brochures, and product sales lists to research vintage trains and their components.

The site’s photo gallery offers visual references for vintage HO models from brands such as Gilbert, John English, Penn Line, Revell, Varney, and Ulrich. For buyers and sellers, the HOseeker Auction provides a place to list, buy, and sell scale model trains at no charge. HOseeker also welcomes contributions of HO and N scale catalogs, brochures, and assembly instructions for engines, cars, and structures, as well as reports of broken links. The site does not provide train appraisals or valuations; its purpose is to make useful reference material and community resources accessible to model train enthusiasts.