Like I said earlier, this was a first run isue only. Later runs did not have the problem.
As for the split gear issue, Nope! Very different materials, and caused by an undersized bore. When the axles were pressed in, the fit was too tight, and the gears would eventually fail. A much discussed and well documented issue that has also been resolved by the manufacturer. They gave away thousands of free replacements. Most common on their GP-18, SD-9 and early E units.
For the railing, I'd say if it's a recent issue, don't worry about it. If an early issue, it will probably be evident in the box.