Single Axle Bogie

Some railway wagons use direct connection between chassis and axle and some others use bogie systems. Direct connection systems generally use two axle (front 1, rear 1). On the other hand, there are many kind of bogie forms for locomotives and wagons. With 2, 3 or more axles (B, Bo, Co, (for locomotives), heavy load wagon etc.). Beside, some bogie systems use only one axle. There are advantages and disadvantages of bogies has 1, 2 or 3 axles. E.g.: When vertical disorders occur on track, middle axle can lose contact sometimes to rail surface. So, it can begin to skid more easily if the system is (Co). Because the vertical force has changed for each axle. Single axle bogies can have advantage especially for urban railway systems. Because, they might need to use narrow curve radius and low floor vehicles. Photo : Höje Taastrup, by Erik Hjelme.