The simulation of sidings at the OKD coal mine in Darkov near czech town Ostrava was concluded in June 2012. The study focused on the identification of maximal capacity for loading railcars at the Darkov underground coal mine and preparation plant. The simulation model was not constrained to the Darkov mine sidings only and included several other nearby sidings; the modelling of personnel and shunting equipment operations were an integral part of the study. The simulation model was also utilised to support several strategic decisions regarding the loading, transport and storage of mined coal and stone.