The K70's were from a series of hastily produced freight cars which were used as demostrator models to complement Bachmann China QJ's steam locomotives. The first production in year 2000 included a single version in red or black and can only be identified by the boxes which had a sticky label in the corner which extends over the perspex window. These are really quite rare as they were only available to dealers, however many were later sold under the table after the QJ's sold out. Essentially they are Bachmann Industries silver series freight car line (which make US prototype models), which was a 'marginal step above the low end of the model market. The second and subsequent productions included the same road number as the dealer version. Despite them being US cars, they initially sold very well due to a total market shortage of true Chinese cars. They are still readily available through most Chinese retailers.
The details on these cars are a little better than the others in the silver series cars, which is also reflected in the slightly higher retail price. The molding is nice and sharp and there were four different shaped coal loads that as far as I can tell were randomly included. Each car came with two metal weights which sit above the wheels and are hidden by a seperate plastic plate. Bracing parts can also be added depending whether or not one wants to run the cars as loaded or empty (note, the pictures below do not show these parts installed). While it would be unfair to judge the proportions to a Chinese K70 class car, they look roughly the same, the main external differnce being the discharge system with the three discharge bays. The Chinese cars have two long discharge bays on each side.
The lettering is extremely sharp and the characters denote the car belongs to the coal mine railways in Jixi (Heilongjiang).
These cars have nice rolling chemically darkened metal wheels with low profiles that should be able to run on code 55 track. They roll much better with the weights added.
Bachmann EZ mates can be replaced with Kadee #5 (standard), #58 (standard, scale head) or #158 (standard, scale head, whisker).
These are the nicest of the non-prototype cars and a cost effective way of populating your Chinese layout with freight cars.