Swiss Locomotive and Machine Works (German Schweizerische Lokomotiv- und Maschinenfabrik; French Société Suisse pour la Construction de Locomotives et de Machines; or for both, SLM) was a railway equipment manufacturer based in Winterthur in Switzerland.

Much of the world's mountain railway equipment was constructed by the company.

The company was founded in 1871 by the British engineer Charles Brown.

[1] SLM built both steam and electric locomotives, including the crocodile type.

This included rebuilding DR Class 52.80 locomotive number 52 8055.