I lost a bag on the train

Most likely at the last stop - but if you are in Osaka they might be able to have it sent there. You should contact them as soon as possible.

Hi there,

I am sorry to hear about your lost bag. It would depend on where the bag is found, the JR Lost and Found section can be reached at 0570-00-2486 or 078-382-8686. Please note that they usually only speak Japanese but you could ask your accommodation to call.

Hope this helps,
Daniel