Madrid−Burgos railway

The Madrid−Burgos railway also known as Madrid−Aranda−Burgos railway is a railway connecting Madrid and Burgos via the Somosierra Tunnel [es] and Aranda de Duero in Iberian gauge.

Madrid–Aranda–Burgos railway
Overview
Status	Non-operational (Colmenar Viejo–Aranda) Operational (Madrid-Colmenar Viejo)
Owner	Adif
Termini	Madrid Chamartín Burgos Railway Variant
Service
Operator(s)	Cercanías Madrid
Technical
Line length	280 km (170 mi)
Track gauge	1,668 mm (5 ft 5+21⁄32 in) Iberian gauge

It consists of a 25 km-long double-track electrified stretch from Madrid to Colmenar Viejo (used by Cercanías services)^[1] and a single-track non-electrified segment beyond Colmenar Viejo.^[2]

Upon a March 2011 landslide in the Somosierra Tunnel, the 159 km-long stretch from Colmenar Viejo to Aranda de Duero has been left abandoned.^[3][1] The 96 km-long stretch from Aranda to the new Burgos Railway Variant has been used for freight transport.^[3]