Has anyone built a lift bridge? How have you addressed the lift mechanism? weights? springs? drum pulleys? My limitations are; one side will have a track platform but should stay open above the track to doorway height, the other side can be used floor to ceiling.
At the ECLSTS there was a nice drawbridge on display. Building one at the entrance to a room with 3-way open close switches and lifting from three feet to six and a half seems to be a simple engineering feat. This will permit access to the living/dining great room for family or One Gauge get-togethers.
Specifications:
One yard/meter free span.
Metal construction (?).
Opens quickly.
Sensors to detect train is not positioned at the bridge.
Power shut off and good conductivity connection across the span.
Single track.