This is CMR's second freight car, after the recently released and succesful P62K. As these cars are identical apart from some external differences, much of the information is shared with the P62K box car review. (Differences about the two variants can be seen above in 'prototype information') They are sold in four-packs (the cars of the second production run are sold individually), and four beareau's have been produced - Guangzhou, Shanghai, Shanghai North & Beijing (although there is nothing to tell which beareau they belong to apart from on the packaging!)
Speaking of packaging, this comes close to the worst packaging I have seen. The cars come in individual two piece plastic clam shells. The cardboard outer box is very thin cardboard. it works well enough, but I can imagine these could be very easily damaged in the mail or in long term storage. I was sort of dismayed when I saw the state of mine from a Hong Kong vendor! It's especially disappointing after being accustomed to the superb boxes of CMR's SS3 electric locomotives. If using the original boxes for storage, make sure the brake wheels are to the right of the box or you will damage some of the undercarriage.
Details are really very good - unfortunately the good bits are underneath the car! Nevertheless they feature etched metal walkways, vertical brake wheels, air hoses and ultra fine uncoupling rods. On the downside, they do have pretty chunky ladders, which don't stand out too much due to the color and the doors don't open.
The cars I have run very freely and are relatively heavy for freight cars which should keep inertia helping the train along - although I'm not sure if that will effect long trains or gradients.
Plastic knuckle couplers - while these ones seem to work quite well, however as a genereal rule I simply don't trust anything apart from KD couplers. They will be very shortly converted to KD's - use medium shank whisker couplers with scale heads (158).
Overall, these are superb freight cars at bargain basement prices! These retail for less than $90USD (Dec 2012) for a 4 pack! There are a few minor caveats, however most of these can be rectified or simply ignored. They look great mixed in with Bachmann's P64's.