I would shim the horizontal strips that vertically support the bottom of the bridge ends bear on to align the top edges of the Lionel and Gargraves track. You will also have solder a center rail( hot) lead and outside rail(neutral) lead to the Lionel track on the bridge, since the bridge track is not physically connected to the Gargraves track either side of the bridge there is no electrical continuity. Choose one side of the fixed Gargraves track and solder leads to the hot and neutral track, I would wire the hot and neutral lead,(bridge and fixed Gargraves) to a male-female connector for disconnecting and removing the bridge. I would also apply vertical stops on the horizontal strips that support the bridge this is necessary for track alignment of the Lionel and Gragraves track. I have three hinged swing up lift bridges, on the hinged side the bridge and stationary track wiring is connected with wire nuts, not issue with track alignment and electrical continuity on both fixed rail side and the rail on the lift bridge.
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