Around the same time, the Victorian Railways was experimenting with replacing cast-iron brake blocks with a non-metallic compound (probably asbestos), so Set 11 was fitted with these, and tested between Seaford and Frankston, in 5 mph increments up to line speed, in both directions. Four tests were made - first using the non-metallic brake blocks with empty and later loaded with cast-iron blocks, equal in weight to a crush load of passengers, and then with the cast iron brake blocks fitted to the train, as well as simulating the load, and finally the empty train with cast iron brake blocks. It was found that the new type of brake blocks performed better at higher speeds, but worse at lower speeds, so on average they gave similar performance and were approved for use. A similar test was later conducted with the Walker railmotors between Laverton and Werribee.