Thanks so much for starting this thread. I have been struggling with a similar layout problem, and, in fact, it has been the daunting prospect of planning and executing a flawless 1:1 / 1:20.3 crossing that has delayed construction on my railroad for FOUR YEARS.
In my case, grading the roadbed for a tunnel would involve a huge caloric/financial outlay in terraforming (probably resulting in the use of an actual 1:1 backhoe – which is cool, but only provides a temporary thrill to the hobbyist) and it might damage a valuable 1:1 ancient redwood tree.
The track-on-a-gate solution was suggested early on, based on a cute magazine article photo, but was deemed impracticable due to the general prevalence of gate-saggage in the sandy soil of the nearby 1:1 scale dog enclosure area, which has already resulted in numerous local gate failures, hinge re-hangings, latch re-positionings, and general frustration among the dog-loving population for the past 20 years. The phrase “Never again!” has been uttered by local gate-protestors.
A manually operated lift bridge was suggested five years ago, but has since been deemed out of the question due to the aging human population of the 1:1 scale area.
Doubts and second guessing about the geolgical stability of structures in the 1:20.3 area, and general aesthetic considerations have resulted in what might be described as “an endlessly recursive self-imposed internal EIR-report deadlock” which was only broken through last week, when an elective medical procedure alerted the 1:1 scale human community to the fact that time is passing and “the roads must roll” soon, if they are to roll at all.
A professional garden railway consultant has been called in to assess the situation and engineer a solution. The sugically recovering 1:1 population has optimistically placed orders for 1:20.3 rolling stock while under imposed bed-rest and is awaiting a professional engineering consultation on October 28, 2013.
The flagstone solution shown here is elegant, Jon.
I now have a serious question, and it is fine if the answer is “no” or “i don’t know” –
Could you, with confidence, run a loaded 1:1 scale hand-truck over this structure 5 times a week?
Specs: The load on the hand-truck generally consists of cardboard boxes stacked 4 - 5 high, containing an aggregate total of 100 - 150 lbs. of mixed merchandise. The operators of the hand-trucks include a mixed population of uniformed UPS and USPS delivery drivers, themselves weighing between 150 and 180 lbs each. They are named Scott, Tom, and Linn.