Baggage Limits on Japanese Trains
 

How much baggage is it feasible to take on Japanese trains, and does it depend on the type of train service?

You can take whatever you can carry. But keep in mind that you will need to carry it.. You won't find porters, and there will often be lots of steps. There is usually room to stash bigger bags behind the last row in each car, or you can put smaller things above, on your lap or under your feet. We usually carry a medium wheeled bag and a backpack or smaller bag each.
japan also has a great system for luggage transfers between different hotel, cities or airports. Costs about $US20 per bag.

I am going to guess that you are going on a cruise, maybe from Nagasaki?

Icuy: Interesting, thanks. Where can I get more info about luggage transfers?

Yes, we are cruising into Osaka after a long time in Asia and I'm torn between staying in the Kyoto area and flying home from Osaka, or trying to make it to Tokyo and flying from there.
All the luggage we have is a considerable concern.

I am not lcuy but here is the info you seek:

http://www.japan-guide.com/e/e2274.html

http://www.japan-guide.com/e/e2278.html

Aloha!