We like your #7 entry. It has and older railroad feel which is good because that would complement our building well. The other design is a little too subway station for us. You have done some great logos in the past and we would love to see some more ideas from you!
An idea we had to spruce up #7 would be to include a train plow like element in the top area that is now gray. That would give it the train feel we are looking for. #11 is nice too but it's railroad feel is perhaps a little too obvious. Thanks for all your hard work!