What is SR Class 4Sub?
{{update|date=January 2017}} {{Infobox train | background = darkgreen | name = Southern Railway 4-SUB<br>British Rail Class 405 | image = SR 4-sub 4101.jpg | imagealt = | imagesize = 300px | caption = 4101 (prototype) in 1941 | interiorimage = | interiorimagealt = | interiorcaption = | service = 1941-1983 | manufacturer = [[Eastleigh Works]] | designer = | replaced = | yearconstruction = 1941-1951 | yearservice = | refurbishment = | yearscrapped = | numberconstruction = | numberbuilt = 185 units | numberservice = | numberpreserved = 1 unit | numberscrapped = | successor = | formation = DMBSO-TS-TSO-DMBSO | diagram = | fleetnumbers = | capacity = 368 - 386 Seats | operator = {{ubl|[[Southern Railway (UK)|Southern Railway]]|[[British Railways]]}} | depots = [[Wimbledon Traincare Depot]] (London) | lines = | carbody = | trainlength = | carlength = {{ubl|DMBSO: {{convert|62|ft|6|in|m|2|abbr=on}}|TS & TSO: {{convert|62|ft|m|2|abbr=on}}}} | width = {{convert|9|ft|m|2|abbr=on}} | height = | wheeldiameter = | wheelbase = | maxspeed = {{convert|75|mph|km/h|abbr=on}} | weight = {{convert|134|LT|t ST|abbr=on}} | axleload = | traction = | traction motors = Four | poweroutput = {{ubl|Early units: 4 x {{convert|275|hp|abbr=on}} <br /> total {{convert|1100|hp|abbr=on}}|Later units: 4 x {{convert|250|hp|abbr=on}}<br /> total {{convert|1000|hp|abbr=on}}}} | electricsystem = | collectionmethod = Contact shoe | uicclass = | bogies = | minimum curve = | brakes = [[Railway airbrake|Air]] ([[Westinghouse Brakes|Westinghouse]]) | safety = | coupling = | multipleworking = | seating = |