I have a prewar 259 with a 265T tender. The first car I bought was a 3814 and the box couplers match perfect. Then I got a 3859 dump car and 2817 caboose which also have box couplers but do not mate up 3814. the 3859 and 2817 are clearly smaller profile also. This has made it very hard to understand what to by on line. I am currently trying to find the Greenberg book. But my desire to move into tin is growing quickly. The hand book I have just states they are O.
Rick.