Before 1942 VR Class Vr3s originally had the class name was O1. They were nicknamed “Rooster” / "Cockerel" and they have the same frames and boiler as the Vr Class Pr1 (Paikku) locomotive. The first locomotive was ordered in 1924 from Hanomag of Germany, number 10 351 and it was numbered 752. The remaining 4 were produced by Tampella Oy in Tampere. They were numbered 752-756.The VR3 was then the largest and most powerful Finnish locomotive.