The railway line Genova – Casella is a narrow gauge railway that connects the cities of Genoa and its hinterland, reaching Scrivia box in the upper valley.
Open year in 1929 (when all the works, began with the ceremony of laying the first stone June 26, 1921), connects the city of Genoa - the station of Piazza Manin - the village of the town of Casella, a town in ' hinterland of the capital, through a wholly 24.318 km long mountain that touches three different valleys: the Valbisagno, Valpolcevera and Scrivia Valley.
The line is a narrow gauge of 1 meter (meter gauge) and electrically driven from the outset. With ten pairs of trains a day (weekdays) carries about 250 000 passengers a year between tourists and commuters. Defined by the press as "the most romantic train in the world" has now joined the traditional role of the pendulum also important tourist railway because of the spectacular landscapes and environments along the way.
The altimetry affected are as follows: the altitude of 93 meters above sea level station Genova Piazza Manin passes in nine kilometers to 370 meters in places Trensasco, reaching 410 meters above sea level of the terminal box after having crossed the watershed of the fraction of cross of Orere, 458 meters asl The maximum gradient is 45 ‰.
In addition to the cities of Genoa and Casella, the line also passes through the municipalities of Sant'Olcese and Serra Riccò.
In the last period of the war the railway was much used by the Genoese population, displaced in the inland villages because of the bombing which was submitted to the city.