My ASD kid is obsessed. He's five and in love with the LIRR. He wants to watch YouTube videos of it non stop. He gets upset if we don't stop to see the train after school. I know this makes him so happy but I also don't want to feed to his OCD behavior. What can I do? He has train toys but he likes the actual movement of the train and sounds. Could this be a stim for him? I need some advice. How can I find a happy medium for him and us.