The Vallorbe–Le Brassus railway line is a standard gauge railway line in southwestern Switzerland.

It shares the section between Vallorbe and Le Day with the Simplon line.

The Pont–Vallorbe Railway (French: Chemin de fer Pont–Vallorbe) opened the line between Vallorbe and Le Pont on 31 October 1886.

[3] The Pont–Brassus Railway (French: Chemin de fer Pont–Brassus) extended the line southwest from Le Pont to Le Brassus; the extension opened on 21 August 1899.

[5] The line was electrified at 15 kV/16.7 Hz AC on 2 October 1938.