During the school winter break, Uppsala Concert & Congress Hall is filled with model railways, miniature landscapes and trains in motion. Large layouts stretch across several venues, featuring long tracks and detailed recreations of historical environments, including parts of Uppsala in miniature. Visitors can watch trains run, explore LEGO displays and try driving model trains themselves. The fair offers activities for all ages and is complemented by a hobby market, restaurant and café. The event runs over several days and is designed for families as well as railway enthusiasts.