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London1864.OnaHackneyboundtrain,aguarddiscoversbloodinafirstclasscarriage-andabodyontherailwayembankment.Forthefirsttime,amurderhastakenplaceonBritain’srailways.Overahundredyearslater,thissingledocumentaryforBBCTwousesthefirsthandtestimonyofthepeopleinvolvedatthetimetoexplorethisuniqueeventandhowitprovokedahugepublicoutcryanddebate.Thestoryquicklybecameanewssensationasthedangersofthebravenewworldofthetrainwerelaidbare.Overahundredyearslater,thewitnessestothisstorymaybelongdeadbuttheirwordssurviveincourttranscripts,memoirs,lettersandvividjournalism.Thesetestimoniesarenowusedtotellthestory,takingthedocumentarydeepintothenineteenthcenturytomeetanextraordinarycrosssectionofreal-lifeVictorianLondon-fromtheenginedriverwhofoundthebodytothedetectiveinchargeoftheinvestigation.WhokilledMrBriggs?