Special heritage service between Santiago - Limache by the old and historic Mapocho - Valparaiso line (former first state railroad zone), on your return trip and at the end of the day, cross "La Paloma" tunnel on the Las Chilcas slope of Tabón Pass, on its way up to the summit.
A continuously growing album of photos that IMHO reveal the awesome and seldom-seen beauty of the railroad world from the dimming of day to dawn's early light! From dusk to dawn, trains roll on! (I'm still finding gems of sunset-to-sunrise surprises!)