It looks like late 40`s or 50`s era from the hairstyles ect !! There are so many train collectors that you should have no trouble selling it !! Even with the damage but it will not make as much as if in good condition !! To get the thumbtacks out take a butter knife and ease it in from the edge till you are next to the tack, by pressing toward the wall and working it a bit you should be able to get it under the tack and just twist up to loosen it !! Take the bottom and sides out first then the top inside tacks, leave the top two corners and one in the middle till last. Then you can roll it up as you take the last ones out !! Might get someone else to roll while you remove the tacks !! I would check with some collector forums for a price !!