I like it.
Train noise I don't think would be an issue: the garden is big, and you could plant some really dense bushes to further shield the sound of you wished.
Also, is one of the bedrooms at the front? You could sleep in that room if the train noise bothered you, but I don't think it will (used to have a train line at back of garden, quite liked it actually).
If you have neighbour noise, look into getting some good sound proofing. That would ne money well spent.