I'm a big N scale intermodal fan, and I also collect N scale intermodal containers. I own containers from all manufacturers (except for Con-Cor, sorry, guys...I just don't like them) and made a chart showing their compatibility in terms of stacking connectivity. Note that the containers with Bottom Pins connecting are listed in three types: 1, 2 and 3. The containers of the same number type are stackable with each other. Deluxe Innovations, which makes the largest variety of container types, does not use a connectivity method. They recommend using "container glue" or putty to temporarily stick containers together. This putty (also available at office supply or craft stores under the UHU brand) can also be used to stack incompatible pin types.