The shunting locomotives Gr. 835 represent one of the most long-lasting and popular Italian steam locomotives groups: built between 1906 and 1922 in a total of 370 units, they are the evolution of the former Gr. 830 of the “Rete Mediterranea”, which remained in service until the 1980s, and some units have been preserved in museums or as monuments in some Italian locations. Their technical features (380 HP of traction power and a top speed of 55 kph) were adequate for the heavy shunting work in the main Italian yards and stations to which they were destined, a task accomplished tirelessly for decades thanks to their reliability. Over the years, they received several rebuilds or modifications to optimize their functioning, which, together with the constructive differences between the sub-series, makes almost all units “unique”, with small details that differentiate one locomotive from the others.