A week or so ago I picked up 3 of the Menards flatcars for $4.99 each after rebate. These are low end flatcars, so they needed a little TLC.
First off, the couplers were so stiff and tight that the were not functional. Out with the Dremel, shaved off a smidgeon on the inside the knuckles and now they work A-OK. Still low end plastic couplers but they are operational.
Next, the flatcars are light as a feather so they needed a load to add weight. Someday the Keystone pipeline will be built so the Seattle & Yakima RR is ready to transport the pipe that will be needed.