What is British Rail Class 373?
{{Infobox train | background = #0047AB;color:#ffffff | name = {{ubl|British Rail Class 373|''Eurostar e300''|TGV TMST}} | image = Eurostar d'hiver quittant Albertville (2018).JPG | imagealt = | imagesize = | caption = A refurbished Class 373 at [[Gare d'Albertville]] in 2018 | interiorimage = Class_373_Refurbished_e300_Interior_Standard_Class.jpg | interiorimagealt = | interiorcaption = The standard-class interior of a refurbished Class 373 | service = 14 November 1994{{snd}}present | manufacturer = {{ubl|[[Alstom|GEC Alsthom]]|[[La Brugeoise et Nivelles|Brugeoise et Nivelles]]}} | designer = | assembly = | ordernumber = | factory = {{ubl|[[La Rochelle]], France|[[Belfort]], France|[[Washwood Heath]], England|[[Bruges]], Belgium}} | family = [[TGV]] | replaced = | yearconstruction = 1992–1996 | yearservice = | refurbishment = | yearscrapped = | numberconstruction = | numberbuilt = {{ubli|indent=1em|38|(31 × ''Three Capitals'', {{nowrap|7 × ''North of London''}})}} | numberservice = 11 | numberpreserved = | numberscrapped = 16 | predecessor = | successor = {{ubl|[[British Rail Class 374|Class 374 (e320)]]|[[SNCF TGV Duplex|TGV Duplex]]}} | formation = {{ubl|20 cars per ''Three Capitals'' set|16 cars per ''North of London'' set|(See {{section link||Set formation}})}} | diagram = | code = | fleetnumbers = | capacity = {{ubl|''Three Capitals'' as built: 750 seats|''Three Capitals'' refurb.: 758 seats|''North of London'': 558 seats}} | operator = [[Eurostar]] | depots = Current:{{ubl|[[Temple Mills Depot|Temple Mills]] (UK)|[[:fr:Technicentre du Landy|Technicentre du Landy]] (France)}} Former:{{ubl|[[North Pole Depot|North Pole]] (UK)<ref name=TRM1290>{{cite magazine |title=Eurostar's new home |first=Chris |last=Milner |magazine=The Railway Magazine |pages=23–26 |date=October 2008 |volume=154 |issue=1290 |issn=0033-8923}}</ref>}} | lines = | carbody = [[Steel]] | trainlength = {{convert|387|m|ftin|abbr=on}} | carlength = {{ubl|Driving vehicles:|{{Convert|22.15|m|ftin|abbr=on}}|Vehicles with one full b