Land owners with pipelines crosding

I work for a pipeline company and we see this all the time. If it was me, I would get a Lawyer. Yes, they do have to pay you restitutiion for anything they do on your property, and they have to fix your drive back to the same or better than what it was. Yes, they can move the line to the other side, but you would have to have a really good reason for them to do that. Now if you don't want to loose your tree's. I would ask why can't they mat over the existing pipeline and work from the other side, or have them bore under ground and have them come up past your tree's. I have seen this done many time. Most of the time they will work with you on thing's like this. If not, make them pay dearly for everything. As far as the contract signed by the land owner in 1937, I think that the contract is only good for the existing line and any work that is done to it. If you look on the contract, it should say how wide their boundary/Right Of Way is from the middle of their pipeline ( Ex. if it say's 100'. They only have 50' on each side of the pipeline). They can also come out and show you where their boundary is, and yes they can mark it for you, but you will have to stay on the butt's. Like I said, get a Lawyer, because they have Lawyer's working for them. Good Luck with everything.