In “Strangers on a Train,” criss crossing as visually represented with train tracks represents the “X” which symbolizes absence and can function as a symbol to mark the spot of treasure. The multiple ways to interpret the presence of a criss cross is within itself a criss cross because of the duality of the criss cross.
This duality suggests that there is a multiplicity of ways to construct morality. Morals are often spoken about in black and white terms, but when there is a criss cross these lines become convoluted producing a grey area of choices that cannot be separated from one another.
A criss cross also implies an interruption of routine heterosexuality. As a character queered by his flamboyant style and murderous streak, Bruno is also a person who often crosses the line of morality. Bruno