Rick,
Your Amsterdam, Bruges, and Brussels guide mentions stopping at Ghent for the day when travelling between Brussels and Bruges. Can I store a 26" wheeled upright? The Ghent station also indicates a luggage attendant. Can they store large pieces? 26" uprights may also be too large for overhead racks on the train. You travel light on your TV shows but not my better half. Thanks.
Both the lockers and the luggage hold counter will fit your bag. On the train if your bag doesn't squeeze into the overhead, you can use the racks for larger articles on both ends of the carriage near the doors.