When the GWR was opened no trains in the United Kingdom were fitted with vacuum brakes, instead handbrakes were fitted to individual wagons and trains also conveyed brake vans where a guard had control of a screw-operated brake. The first goods wagons to be fitted with vacuum brakes were those that ran in passenger trains carrying perishable goods such as fish. Some ballast hoppers were given vacuum brakes in December 1903, and general goods wagons were constructed with them from 1904 onwards, although unfitted wagons (those without vacuum brakes) still formed the majority of the fleet in 1948 when the railway was nationalised to become a part of British Railways.[93]