Dune

Dune was part of the original group of men that Ladd Russo assembled for the kidnapping aboard the "Flying Pussyfoot:"

To get aboard he killed the about-to-retire conductor "Tony" and stole his conductor uniform and subsequently wore it.

[Spoiler] Later Claire Stanfield reveals to Dune whilst interrogating him that Tony was the man who taught him everything about conducting a train and is enraged.

Dune is then killed by Claire who pushes his entire right arm into the train tracks, then his face. [/Spoiler]