Didnt happen in Coach, but in the Diner. While on my way from CHI - PIT on the Capitol Limited, I was sitting at a table with two Hasidic Jew's. The waitress came up to one of them, put her hand on his shoulder, and said "Good Evening! What can I get you tonight darlin?". The guy pushed her hand off of him and said "You should NEVER touch another man! You must ask for forgiveness!" She looked at him, and with a look on her face, said "WELL EXCUUUUUUUUUUUSE ME!! What would you like for dinner?". (The guys left the diner)
I think that this is something that ALL OBS crew members should be made aware of. It is generally taboo for ANYONE to touch ANYONE except when shaking hands, or helping up and down steps, etc. The reasons are a myriad, from religious as shown here, to hygienic, to personal space, to jealous wife, to whatever.
The baseline approach should always be hands off except in offering aid.
That being said, the passengers who choose to not live OF this world still choose, by obviously riding Amtrak, to live IN this world. They need to be a bit less, well, touchy.