Ben Ontspoord is a specialist retailer focused on buying and selling used Märklin model railway products. Its online shop offers a broad selection of items for H0, 00 and Gauge 1 layouts, including track, locomotives, train and carriage sets, passenger and freight wagons, signals, relays, overhead equipment, transformers, controllers, digital systems, decoders, tools, accessories and repair parts. The catalogue ranges from vintage and collectible pieces to contemporary digital models and layout essentials.

Products are sourced from dismantled model railways and private collections. The company states that its used track is in good condition, free of defects and electrically tested. Locomotives are used and thoroughly tested; mechanical parts carry a three-month warranty from the invoice date, while cosmetic condition is described for each item. Digital locomotives include their decoder address in the listing. Ben Ontspoord also purchases Märklin H0 collections, including collections offered due to retirement from the hobby or inheritance.

The business operates as an online shop with a warehouse for order collection, rather than a physical retail store.