Tried them and didn't like them. They are way over sized, toylike, and scale out to almost 1/16th. They didn't work that great, they change 4sec after the train passes and its none adjustable. I have been using South Bend signals www.sbsignal.com and leave then out all year with no problems. Last year they were under snow for almost 3 months before I saw them again. All I did was cover them with a plastic soda bottle to prevent direct snow coverage or rain. They are very close to 1/29th scale and I have two of their cantilever signals with 4 pennsy signals each. On the single stand alones the optical detector goes between the rails, which you can hardly see, and you can battery power them or power off the track. On the cantilever bridges the detectors a built into the bottom of the cantilever and detect the trains looking down on 2 tracks. These are time adjustable from 4 to 15 seconds each between signal changes from clear to occupied to warning back to clear. You can see how they size up perfect with the Aristo signal bridge. They now also offer a 2 or 3 or 4 track bridge with your chose of any signal they offer in any configuration you want. The single signals you can place a stake on the bottom and move them around the layout as you like. Jack
[ x2 
] 
