NH Joe re: garden railway. (I do like what you have done with your club garden railway) RE your ?'s. Fine details here in this post on the bridge and set up location etc. all details; can scroll down for the links and more details further down the thread; https://ogrforum.com/...vated-garden-railway
I have set up 5 O scale/gauge tracks now on the O gauge island. Tracks 1 & 2 outer loops are rails slid into the O scale (G narrow gauge) tie strips and good quality clamps to hold them together. The rails are long 6 feet I stager the joints as much as possible 2-3 feet so it allows a good even curve. This way I can get a good wide radius curve without kinks. This allows the biggest O scale 2 rail engines to go around the broad curves. Tracks 3 and 5 are Atlas 3 rail track. Here is the link to the G track used; https://www.sunsetvalleyrailro...om/track---rail.html We already had this track available at the garden railway club so did not cost us to buy more. The Atlas track I have used for a few years just pull it up in the fall for use with the Christmas train set ups / displays.
The advantage of using the Sunset Valley G narrow gauge track is that the ties are wider more stable in the gravel. With the longer rails and tight rail clamps the power supply all around this huge loop only uses one power feed location and through winter snow and freezing or summer heat wave and all day sun - the track floats on the gravel expanding and contracting and never looses electrical continuity over the years. The center rail is not that difficult to install use screws. I can form the track to fit the available space by bending the rails in a rail bender easily to fit the curves I need.
Where as the Atlas track tends to need a couple of power connection points and occasionally needs to have the track connectors replaced after long severe weather hot or cold. With track ties closer; gravel and tree debris sits on top of the ties and needs more cleaning then the G track. Also needs more work to keep it level in the gravel. The Atlas track has a lot of joints as the track sections are much shorter. The slip on rail connectors do not hold tight enough for good electrical connection from year to year.
As for the G scale bridge yes work continues on extending the G scale railway over the bridge. We just installed the bridge and widened the O gauge Island over the winter and moved the mini rail tracks to give us more room.