If and only if you buy both the 46350 and 46351 dump car sets, the freight train can be completed with the 46982 freight train baggage car available free for this purpose. The class 50.40 freight train steam locomotive to go with this is also being offered exclusively for Insider member only under item no. 37040.
This freight train baggage car can be found in a DC version in the Trix H0 assortment under item no. 24095 exclusively for Trix Club members.