Who said "Trust is a luxury we cannot afford on this train."?

This quote is attributed to Colonel Arbuthnott.

Trust is a luxury we cannot afford on this train. - Colonel Arbuthnott

"Trust is a luxury we cannot afford on this train."

Colonel Arbuthnott Relationships

Character in Murder on the Orient Express

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"A man's past can always catch up with him."

"The key to a happy marriage is communication."

"Marriage is about compromise and understanding."

"Life's greatest treasures are relationships."

"Trust is a luxury I can't afford."