cidchase said:
Hi Ed, maybe a grade crossing with the road continuing on under the bridge?
This is a good idea, unless you're set on having a stream or river feature. Either way, I'd add a partial view block between the two tracks, so that the view of the high bridge is somewhat obstructed: a little "mystery" to help disguise the "edge of the world". Just put a jog in the road or stream, then add a small structure or a grove of trees. Obviously, for a stream you'll need to cut out part of the base layer of foam.
I think your town looks good, but I'm wondering if you've got much industry planned to give the railroad something to do. (Btw, who makes the houses? This is an aspect that's lacking on many layouts, as space is usually at a premium. I have a couple of small areas planned for houses, but most of the structures so far are railroad-related.)
Did you ever solve your problem of finding something to hold the tracks in place? I still think that the Atlas track spikes are your best bet: they're made for the job, and are pre-blackened, so they're not very noticeable once installed. You can also remove them after you've glued down ballast, as it should hold the track in place.
I also have some reservations about the method of joining flextrack: on a curve, a railjoiner will better align the ends of the rails. It doesn't take much of a rough spot to derail an HO train.

I do like the idea of soldering the jumper wires for good electrical contact. For making curves with flextrack, I use railjoiners, soldering them to the rail and joining enough pieces of track together to make the curve before laying the track. This way, the rails become one continuous piece through the curve, with no ends jutting into the gauge from the inside rail. All of the track on my layout is soldered together at the rail joiners, with electrical gaps cut later, as required. I notice in many of the photos, you've used sectional track: it's also a good idea to solder the rails together where they join, as these areas may cause electrical problems over time. Some modellers prefer to add separate feeder wires to each section of track, instead. Either method will work.
Wayne