For dimensions of machined surfaces without tolerances stated, the general tolerances as per DIN 7168 m apply. For non-machined surfaces of cast-steel wheels, the tolerances for castings as per DIN 168 part 1 - GTB 17/5 apply.
DIN 20555:1989 history
2012DIN 20555:2012 Wheel sets with taper roller bearings for mine cars, exterior spring suspension
1989DIN 20555:1989 Wheel sets with taper roller bearings for mine cars; exterior spring suspension