Charles Francis Adams wrote about it in
The Atlantic in 1876:
https://www.theatlantic.com/magazine/ar ... he/631411/. This version is paywalled but I think it's possible to find
The Atlantic from the 1800s free online via HathiTrust or another service like that. According to Wikipedia he also mentioned it in this book: Adams, Charles Francis Jr (1879). Notes on Railroad Accidents. New York: G.P. Putnum's Sons. pp. 125–144. I haven't looked that one up yet, but it's probably available via Google Books.
I'm working on a book about the "invention of safety" in the 19th century and hoping to look at Charles Francis Adams's papers and the papers of some other Mass railroad commissioners and related folks. I will report back when I find more.