The boiler at the Holiday Inn, looks nothing like the one in the movie. It may be the original one that was in the Queen at the time Jim bought it, so the brass plate may be misleading. The boiler in the film was fake, just a shell. At times the dummy boiler was removed for closeups of Rose & Charlie. The boat was powered by a diesel engine hidden under the green box near the benches. (The exhaust may have been diverted into the engine to make the cylinder move and eventualy piped into the chimney and vented out.)