I believe this site belongs to "Native Speakers, Etymologists, and Serious Language Enthusiasts". I belong to the third one.
This question is a very interesting question which received 18 upvotes (including mine) and has this answer.
I don't mind at all how many upvotes this answer receives. However, I do mind its qualities.
I don't think the answer has the standard quality required by "Native Speakers, Etymologists, and Serious Language Enthusiasts".
It has a lot of flaws and I consider it a pure "fabrication" which has nothing to do with Etymology of "Train" and "Coach".
If I had been a moderator, I would have warned him the minute I saw the answer (which I did as a member).
This is the first comment that I made after the answer was posted:
@Rathony: Your link about "coach" explicitly reads "Meaning "to prepare (someone) for an exam" is from 1849. Related: Coached; coaching" which is different from "help some with an activity". What activity? Was it used in 1849 and never used after 1849? (It was commented around 5-10 minutes after the answer was posted)
I am copying a train of comments.
@Rathony: "The downvote is not mine,"
Note: As there was only one downvote at the time. I just wanted to tell him I didn't downvote it yet as some members do sometimes.
@Mitch. "The downvote is uninformed. Nice etymological exposition."
@Rathony: Nice etymological exposition doesn't put what was written in the plain text. Really?
@Mitch: " I don't get your objection. Or rather I can't tell if you have an exception except that you say 'really?'. Can you elaborate?"
From here on, @Mitch's comments are omitted. The followings are all mine:
@Rathony: The answer states that "coach* was used in 1849 in the modern sense of "help someone with an activity". The online dictionary (which is available to anybody) states that "coach" meant as a verb "to prepare (someone) for an exam" from 1849. The year matches, but the explanation doesn't. If it was made up by him, he should explain on what basis he made up "help someone with an activity". What activity? Baseball was there in 1849? Tennis? You can call many things an activity. There is no explanation on that part.
Furthermore, the dictionary states "coach" as a noun started to mean a tutor who "carries" a student through an exam; athletic sense is 1861. Then, what activity? Both America and Britain started to use "coach" as a verb and noun related with "study". Not an activity. Then, where are all others who were busy criticizing others' answers and questions? Are you guys giving him a special treatment? No comment at all about its poor contents? Come on, Mitch. You have to be neutral, right?
He fabricated a story with "help someone with an activity". Isn't it a fabrication? If "helping someone with an exam" is the only activity on the face of the Earth, it is not a fabrication. (I changed the word. Thanks)
Sorry, I don't get your point. It took 31 years for Britain to extend the meaning to athletic sense. If you think 31 years in Etymology is nothing, fine. I don't agree with you as we are not sure what kind of athletic sense it took in 1861? What usage? What sports? Is there any evidence to prove it? Was there any exam for sports? (I could suspect there might have been). I will leave it there, if you don't mind. Nice conversing with you.
I would have deleted this answer an hour ago If I had posted it. I am sure you know what I mean.
Still no comment from any moderator. I would like to know (1) why there is no comment from them, (2) if the answer is acceptable to the EL&U standards, and (3) if acceptable to EL&U standards, I would like to have your opinion on the reason why.