Anchors Aweigh!
(1945, Gene Kelly, Frank Sinatra)
One scene features a pair of Tanners Motor Tours motorcoaches in red/white livery operating for Grayline, although there's not much of them to see. Los Angeles-based Tanners operated movie studio tours.
As the sailors disembark, we glimpse a large snout, but other than '38' in the windscreen, there's little more to go on: