I I saw this on the carendt website. Simple idea and simple construction. I could see something like this for a Halloween layout. This layout uses a Bachmann On30 trolley that operates back and forth automatically. A Lionel trolley could be used as well. Click on picture to enlarge.
Paul,
Here’s a variation at low tide (different scale, outside, but applications to 3-rail indoor apparent)
http://www.mylargescale.com/forum/topic.asp?TOPIC_ID=40764&whichpage=1
Dave - I like it. Staight line railroading. I’m diggin it!