The aim of this work is to verify the working load of forklifts (generally rolling-stock) based on actual transports and following optimization using a universal simulation model in the software Witness. This aim can be characterized in three following phases. In the initial phase, the actual transport data are obtained for a monitored interval and for the distance matrix between the network points of the actual transports. In the second phase, obtained data are implemented into the simulation model and then the simulation is performed to find utilization of all forklifts. In the last phase, the workload is validated and the optimization is performed using Witness Optimizer.