We have previously discussed the simulation of networks of queues for general characteristics of passage times of a single job type, using the regenerative method for simulation and the idea of tracking a distinguished job through the network. We consider here, from a somewhat different point ov view, passage time simulation in closed networks of queues having multiple job types. Our results provide a means of obtaining, from a single replication, point and interval estimates for passage times of the several job types. They also yield a statistically more efficient estimation procedure for passage times of a single job type. © 1979 Springer-Verlag.