A train loading system for loading material onto cars of a train is disclosed. The system comprises a material bin arranged to receive material to be loaded onto the train, a closure device arranged to facilitate control by an operator of the amount of material loaded into each car from the material bin, and a car mass estimator arranged to estimate the mass of material loaded into each car. The system also comprises a display arranged to communicate to the operator the estimated mass of material loaded into each car. A corresponding method is also disclosed.