well my layout was 550 sq feet befor the add on i am still trying to figer out how long my main line is but it is so hard when you have and interchange with four other railroads and each of them has a very long main lineand it's own yard i know the new add on is around another 200 sq feet. i don't have a work shop mine is on wheels when i want it i pull it out from under the layout and go to work a old desk works great for my work bench i just put wheels on it and when i don't need it back under the layout till next time .. think god for chairs with wheels one good push and i'm off to the other end of the room. (wheee) well guys i got to go i just got me ahold of 60 old e7 form atlas the ones that have the screwy wheel trucks wheels 4 in front wheels 6 in back