Who Can it Be?

Who Can it Be?
Both: Who can it be? Who can it be?
A: If it's someone on this train and I know it's not me
If I'm not a suspect and neither is she
Both: It's got to be someone else, who can it be?
U: What about that conductor who shouted "All aboard"?

A: He looked a bit suspicious or maybe just looked bored
Maybe it's that cowboy who wore that cowboy hat?
U: A fellow could hide lots of strange disguises under that
Who can it be? Who can it be?
A: Le Master of Disguise is full of trickery, but I will unmask him, just you wait and see
It's one of these passengers, who can it be?
U: What about that lady who wore an overcoat?
A: With something sparkly under it, I didn't fail to note
U: She wore a tan fedora and had a sneaky look
A: She's certainly a suspect in my little black book
Who can it be? Who can it be? If it's someone on this train
U: And I know it's not me! If I'm not a suspect and neither is he
Both: It's got to be someone else, who can it be?