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Dave Ware writes: Plans from the Master Powerline Set of 1973/74 were simplified so that it could be built with a Senior Powerline Set.
Instead of driving the Drum Hoist via ladder chain from the Powermatic motor, they were mounted side to side and direct coupled. Also the DC3 motor driving the flywheel via another ladder chain was eliminated and the flywheel was driven from a shaft on the Powermatic motor with a rubber band belt. The resulting drive arrangement was much simpler.
A battery pack for the DC3 motor was originally used as the counter weight. Since this was no longer needed, an old speaker magnet was used instead.
Bruce Hansen writes: This is the Bascule Bridge model from an #8 1/2 set manual. There’s a mix of parts vintages with this set, 1935-37 P51 motor and girders/base plates from the 1950’s. The bridge has a basket in the rear for adding weight to balance the bridge.
Gary writes: This bridge is modeled after the lift bridge located at the entrance to Duluth Harbor from Lake Superior in Duluth, MN. I made it from extra pieces I have from incomplete sets but I did not alter any pieces. It was a lot of fun to build and it’s fun to show it off to friends.