Wengernalpbahn Class BDeh4/4 number 121, introduced in 1970, was built by a consortium of Schweizerische Industrie Gesellschaft (SIG), Schweizerische Lokomotiv und Maschinenfabrik (SLM), Brown Boveri & Cie (BBC), and Societe Anonyme des Ateliers de Secheron (SAAS) - Date unknown Anonymous Photographer.