What is British Rail Class 403?
{{Infobox Train | background = #006600 | name = Southern Railway 5-BEL<br>British Rail Class 403 |image = Pullman_284_'Vera'_at_London_Victoria.JPG |caption = Former 5BEL car, 284 ''Vera'' at [[London Victoria]] on 15th August 2003. This car was previously in unit 3052, and is now owned and operated by [[Venice Simplon Orient Express|VSOE]] | service = 1932–1972 | manufacturer = [[Metropolitan Cammell|Metropolitan Cammell Carriage, Wagon and Finance Company]] | factory = | family = | yearconstruction = 1932 | refurbishment = | numberbuilt = Three sets (15 cars) | numberpreserved = 14 cars | numberscrapped = 1 car | formation = 5 car set: DMBPT-TPFK-TPFK-TPT-DMBPT | designation = Sets 2051–2053 (later 3051–3053);<br>Cars 279–293 | capacity = 40 First, 132 Third<br>(DMBPT: 48, TPT: 56, TPFK: 20) | operator = [[Southern Railway (Great Britain)|Southern Railway]] (1933–1941, 1946–1947);<br>[[British Rail]]ways (1948–1972) | depots = | lines = London to Brighton | carbody = All steel | carlength = | width = | height = | floorheight = | doors = | maxspeed = {{convert|75|mph|km/h|0}} | weight = Total - 249 tons | acceleration = | deceleration = | traction = Eight {{convert|225|hp|kW|0|abbr=on}} traction motors | powerout = {{convert|1800|hp|MW|3|abbr=on}} | transmission = | aux = | powersup = | hvac = | voltage = 660–750 V DC | collectionmethod = [[Third rail]] | bogies = | brakes = Air | safety = | coupling = | multipleworking = | gauge = {{RailGauge|ussg}} }} The [[Southern Railway (UK)|Southern Railway (SR)]] gave the designation [[SR Multiple Unit Numbering and Classification|'''5BEL''']] to the 5-car all-[[George Pullman|Pullman]] [[electric multiple unit]]s built to work the prestigious '''B