The Southern Railway (SR) gave the designation 5-BEL to the 5-car all-Pullman electric multiple units which worked the prestigious Brighton Belle trains between London Victoria and Brighton. These units survived long enough in British Rail ownership to be allocated TOPS Class 403. Between 1933 and 1935 the units were designated 5-PUL (the 'PUL' code was then used for the 6-PUL units).