A couple of simple improvements...

[Fluesheet]

...for Accurail cars. I'm not sure if these will apply to all Accurail cars, but they work for the various 40' boxcars, in all styles.
If you don't use the Accumate couplers supplied with these kits, you'll find that the coupler pockets are not quite deep enough to accommodate the bronze centering spring used with Kadee couplers:

Attaching the coupler cover snugly will crush or distort the protruding parts shown, resulting in poor coupler performance. The solution is to build-up the sides of the coupler pocket, using strips of Evergreen .010"x.020" styrene, as illustrated:

Wayne, you use styrene like the rest of us use duct tape!

That's a good bit of advice on the spring. I solved the same problem by cutting down the centering spring until it fit in the box - it worked, but was somewhat tedious.

Matt