Hi all, I am in the planning phase of a furniture factory on my layout. I did a lot of reading on threads/books on the topic but i have come up short on a very specific topic. If for 1968-1970, i should be using 50' or 40' boxcars for inbound lumber to the furniture factory. I take it, that in either case i should opt for double doors (using a fork lift for more efficiency) rather than the more time consuming 6' door boxcars of the past. I also understand that 50' is more economical that 40' with respect to shipping an economies of scale, and also that 40' might be preferred based on specific loading-door spacing of the customer etc.... (I saw some interesting 10' door, 40' cars though for NP/SP). My outbound finished product is going to be in 50' double door boxcars. As an added question, if loading/warehouse door spacing is not an issue (ie dock present and/or large/multiple doors), would mixing 40' with 50' boxcars serving the same industry make sense? Or is it more standard/plausible to have all 40' or 50' cars spotted. Many thanks in advance for your time/replies Yannis.