London1864.OnaHackneyboundtrain, aguarddiscoversbloodinafirstclasscarriage-andabodyontherailwayembankment.Forthefirsttime, amurderhastakenplaceonBritain’srailways.Overahundredyearslater, thissingledocumentaryforBBCTwousesthefirsthandtestimonyofthepeopleinvolvedatthetimetoexplorethisuniqueeventandhow...