I’m using Legacy 1.51 and it seems the older TMCC operating cars, namely the Shark Aquarium Car and Christmas Caboose, are not able to be added when building a train. I can add them in the menu, but they do not work, i.e. no response to any command given to the train. I have the newer vision line cattle car and that works fine. In their manuals these cars indicate that they can be operated as part of a train.
Is this a known issue?