We study the overdamped motion of interacting particles in a random medium
using the model introduced by Pla and Nori [Phys. Rev. Lett. 67, 919 (1991)
]. We investigate the associated depinning transition by numerical integrat
ion of the equation of motion and show evidence that the model is in the sa
me universality class of a driven elastic chain on a rough substrate. We di
scuss the implications of these results for flux line motion in type-II sup
erconductors.