In the film Clown Train, sound plays a huge role in creating an eery atmosphere for which the story is to be told. The constant sound of electrical wires flickering/faultering, the squeeky train tracks, industrial sounds and static room noise all work together to provide a dangerous feel to the location and setting of the story. These sounds, along with the vibrant talking voices of the two characters, enable Clown Train to be dramatically suspenseful, literally giving me goosebumps whilst watching and waiting to see what was going to happen next. I think that the begining of the film is hugely effective in creating such a creepy atmosphere, witht he first 26 seconds being engulfed by a black screen and loud, eerily squeeky train noises.
Another genre film that makes use of sound in the same manner as Clown Train is Batman: The Dark Night. As this film is one of my favourite films, this question instantly made me think of it. The eery industrial sounds present in Clown Train remind me greatly of similar soundscapes used in The Dark Night in instances where The Joker is near.