The ability to bring a sword on a train depends on the policies of the specific train company, as well as the laws and regulations of the jurisdictions through which the train is passing.

In many cases, transportation companies have rules against carrying weapons or potentially dangerous items. A sword, even if it's blunt or intended for ceremonial purposes, might be classified as such. If swords are allowed, they are typically required to be safely stored in a sheath and potentially within a carrying case.

For example, Amtrak in the United States allows swords in checked baggage, but they must be sheathed and securely wrapped to prevent injury.

In the United Kingdom, train companies generally follow national law, which prohibits carrying a knife or sword in public without a good reason, unless it has a folding blade with a cutting edge 3 inches long or less.

In any case, it's recommended to check with the train company beforehand to understand their specific policies. It's also important to consider the laws of any jurisdictions you'll be passing through or stopping in, as you could potentially be subject to them while on the train or at the station.

And remember, even if it's technically legal to bring a sword on a train, it might alarm other passengers or staff, potentially leading to unnecessary complications. Always consider the potential implications and safety risks before deciding to transport a sword in public.