Bill,
I’m using what they call "pea"gravel around here. It is not “round” gravel. The gravel is not quite as small as I would prefer, but the smallest gravel available in a truck load. I started with 8 tons and will probably have to get more to finish the second line.
HJ,
The wye design is a bit of a compromise. Unfortunately, I have more left hand switches than right hand switches. As a result, I also had to use two left hand switches for the “runaround” in the yard.
For some reason, I can usually get a “deal” on LH switches on eBay, while the RH switches get run up higher than retail.
The wye location was also a compromise. I would have rather located the wye off the long straight, but space limitations excluded that scenario.
I have several tight S curves on the layout. They have not given me any problems and add much to the visual appeal.
The entire layout has been built using 1 foot sectional track and R1 curves. This causes many compromises, as things have to be designed to match up…no flex track to make things easy.
Ralph