Upvote:8
There are other noise sources besides trains: traffic, party zone, construction, etc. So a train map alone won't guarantee you a quiet room.
Your best shot for this type of thing is to read customer reviews on Tripadvisor, Google, etc. If there is excessive train (or other noise), it will show up there.
The trick is to focus on the low-rating reviews, ignore the entitled complainers, and look for recurring themes. This will not only reveal noise issues but any other downside of the hotel, like room size, value, design, service etc. (which may or may not matter to you).