Try this:
Set up the float "siding" so trick 2 cannot pick up from the float. You can then terminate trick 1 when it has dropped of its four cars.
Stefan
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Stefan Bartelski
Home layout: The Blue Ridge Line, an HO representation of the L&N Etowah Old Line from Etowah to Elizabeth and the Marble Hill branch (Georgia Marble Railroad), set in 1986 (under construction)?
Modular Layout: Shoofly module of the Country RRoads Modular group