Las,
“but can you give me the marei makomos for the Rash, Chidushei Haran and the Mishkanos Yaakov.”
The Rashi is in eruvin 6a (quoted in Igros Moshe) and so is the ??’ ??”? ? regarding the Ran, it is also mentioned in Teshuvas ???? ????, ????”? , wherein one rav claimed that once train tracks were constructed all over Europe, that according to the Ran all cities are to be classified as a RhR. All the above disagreed including the ??? ???? ? and the ?????? ???? of Kutna.
As for the MY, Its an extremely long teshuva, so i will post the page in a later post.