The Finnish VR Class Tk3 (original classification 'K5') was a 2-8-0 light freight locomotive.

This allowed them to operate on lightly laid secondary lines, but during their many years of service, up to the end of the steam era, they were also widely used on main lines hauling slow passenger trains that made frequent stops.

They were affectionately called "Pikku-Jumbo" (The Little Jumbo) because of their good performance despite their low weight.

They had low fuel consumption (usually Tk3s used birch wood) and good riding characteristics.

Two Tk3-type engines were originally supplied by Tampella to Rauma Rautatie as Nos.