Greenway of the Alberche Activity · San Martín de Valdeiglesias, Sierra Oeste, Madrid Image of San Martín de Valdeiglesias, not of the place itself. A route of some fourteen kilometres laid along the trackbed of the Madrid-Almorox railway, whose branch towards the Tiétar was never brought into service: in 1934 a train made a symbolic run over the 7.5 km to Pelayos and none ever passed again. Photo: Cruccone (CC BY 3.0) What to see and do in San Martín de Valdeiglesias