Good theme for uniting a group - could be after a merger, change in leadership, major industry changes, or a simple change in administrative policy.
Chattanooga Cho Cho Music.
Orient Express theme.
Prize could include some major train ride.
Use a local group to prepare a course or guest speaker on a local train.
Set up model trains in exhibit hall - or overhead for greater interest in banquet area.
Leadership team who presents a message should wear engineer's hats - maybe even coveralls.
Logo could include trains, engines, etc.