Another suggestion during the first operating session was to come up with a system where some cars would not be moved due to still being loaded or unloaded. An excellent idea, which I finally took care of yesterday and today.
I went to our local OfficeDepot and purchased a package of Avery address labels #8176. These would fit perfectly on the Micro-Mark card pockets my waybills go in. I had these printed with the connotation shown below. When a car is not to be moved, the entire card pocket is simply turned around as shown. I believe this one will work!