The OO section is where Alton Model Railway Group began, with the construction of its first layout, Welles in the mid 1980s. This was followed by a model of Alton as it appears in the current day, allowing for a mixture of preserved and mainline trains.
Although the section and the Group has moved on with both layouts being taken over by Group members, Welles has since returned to Group hands following the passing of Denis Stevens, and is currently being refurbished and converted to DCC, with the hope of returning it to the exhibition circuit. A new layout is currently being considered.
The section members have a wide range of interests, mainly in the Southern Railway and the Great Western Railway.