As with the Merchant Navy class, electric lighting was provided on both locomotive and footplate, powered by a steam-powered generator below the footplate. The gauges were lit by ultra-violet light. This enabled clearer night-time vision of the boiler steam pressure gauge and the brake pipe vacuum pressure gauge whilst eliminating dazzle, making it easier for the crew to see signals along the track. Close attention was paid to the ergonomics of the cab, which was designed with the controls required for operation grouped according to the needs of both driver and fireman, thus promoting safe operation. As an aid to the fireman, a treadle used steam pressure to open the firehole doors, where the coal is shovelled into the firebox. The footplate was entirely enclosed, improving crew working conditions in winter. Other refinements and innovations used on the Merchant Navy class included steam-powered clasp brakes and the unusual 6 ft 2 in (1.88 m) Bulleid Firth Brown (BFB) wheels.