Charlson

In the short story The Red Signal, Charlson is the chaffeur of the psychiatrist Sir Alington West. After a dinner hosted by the Trents, he drives Sir Alington and his nephew Dermot West back to Sir Alington's residence at Harley Street. Sir Alington then dismisses Charlson for the night because Dermot says he can take a cab from there to his next destination.

Portrayals
In the episode The Red Signal of The Agatha Christie Hour, a TV film adaptation of the story, the part of Charlson is played by David Rolfe.