In May 1855 it opened the line from Bussigny-près-Lausanne to Yverdon and on 1 July 1855 from Bussigny to Morges via Renens as part of the Jura foot line.
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The oldest part are the sections opened by the West Switzerland Company (French: Compagnie de l'Ouest-Suisse, OS) in May 1855 from Yverdon-les-Bains to Bussigny-près-Lausanne and in July 1855 from Bussigny to Morges via Renens.