Why do i get headaches after long train rides home ~45min each? happens almost every time.

I would : Try taking aleve (naproxen) or ibuprofin prior to getting on, not sure what it is about the ride that's doing it but stopping it before it starts can help. If you get recurrent migraines, topirimate 50 mg at night can help, make are sinuses are clear and you have had a recent eye exam. Good luck.

HAs on Train: Some people are prone to motion-related has, others are sensitive to the fumes/vapors that accompany them. I assume you don't get these on a car or bus? How about on a bike or motorcycle? Assuming not, you might try preventative analgesic use - tylenol (acetaminophen) or nsaids - before the rides. What type of headache is it? Migraine? Cluster? If migraine, take a migraine formulation before you ride.