[enyafriend]

Having a suitcase on the train isn't much of a problem, as long as you stay clear from the morning and evening rush hour. Otherwise, some people might get annoyed with that. What's more if there's 5 suitcases along the train's walkway!
Besides, depending on how heavy your suitcase might be, the real problem will be lugging them up and down the many staircases around the train stations.
But if you really want to save money, like some have suggested, taking the night train is a good idea. You save on a night's accomodation expenses, and at the same time, arrive at a new destination the next morning.