The Oensingen-Balsthal Railway (OeBB) celebrated its 125th anniversary on the weekend of June 15/16, 2024. On this occasion, several special trains free for the public circulated between Balsthal and Oensingen and vice versa. Steamlocomotive E 3/3 # 2, built by SLM in 1899, pulls a train with cars of the association Historic Seethalbahn (HSTB) between Klus and Oensingen.