I have observed an HO variation in action at a local club. What seemed to add significant realism is that the road follows hill and dale.
Integrating a lift bridge into the fray might work using similar stoplight circuitry resulting in tons more added interest. Then add a moving ship to trigger the bridge....and on...and on
Unfortunately, what with the excessive space requirements in O, it can soon overwhelm the train aspect of the layout. But adding a vignette of action would be easier to work into an existing layout while producing a fascinating focal point. Hmmmm. That PW 313 just got a lot easier to work into a scale layout.
Bruce
