Ok.....so I have moved into a new house of which I have been "allocated" about 405 square feet of space in the basement for the new layout (less stairs, furnace and hot-water tank). I model 1972 for CPR between Crowsnest Pass and Grand Forks (Alberta to British Columbia) and intend on continuing passenger service through the layout even though the prototype got rid of them about ten years earlier (so there will be heavyweight and streamlined passenger cars as well as a mix of every freight car known except modern centrebeams, autoracks etc!). Am planning on a triple deck layout to give me the mainline run that I want (the multideck layout format is something I am not particularly adverse to). I want to run thirty car trains and under so this works out to about nine feet for thirty 40' box cars exclusive of motive power and caboose (to set the length of yards and sidings excluding yard leads etc). Am interested in comments from the members on the following: 1. Minimum curve radius; 2. Deck height levels; 3. Deck separation; 4. Anything else!!! Thanks in advance!