I'm a new member and found many Route Guides, but not one for the Acela routes. That would really help.
There are a number of manuals for individual trains. I'm looking for one on the Acela using the same template. In some respects, I don't know what I don't know. The manuals are at: https://live.dovetailgames.com/live/train-sim-world/articles/article/tsw-help I was looking for a similar Acela manual there.
That's too bad. Given my software background, we would never release a new product without the necessary documentation. In the case of TSM3 perhaps the development group has some design documents that could be used to generate the appropriate documentation for each engine released. Another idea would be to produce a document template and enlist a volunteer user to produce the document with some sort of reward such as a free release of the specific new engine.