|Line length||105 km (65 mi)|
|Track gauge||1,435 mm (4 ft 8 1⁄2 in) standard gauge|
|Electrification||3 kV DC
The first section of the line, between Sondrio and Colico, was opened in 1885. It was completed in 1892–1894 with the section from Colico to Lecco, where it was connected with the rest of the Italian network.
The section from Tirano to Sondrio had a different origin, being opened in 1902 as a private railway by the Società Anonima per le Ferrovie dell'Alta Valtellina (FAV). It was integrated in the state network in 1970.
- Prospetto cronologico dei tratti di ferrovia aperti all'esercizio dal 1839 al 31 dicembre 1926
- Sergio Viganò: Alta Valtellina ieri e oggi. In: ″I Treni″ Nr. 167 (January 1996), p. 32–38.
- RFI - Fascicolo linea 26
Media related to Tirano–Lecco railway at Wikimedia Commons