RARE 1917 Indianapolis Railway Co. envelope In. to Sangamo Electric Il. Indiana

Description

1st - I AM NOT A BUSINESS AND DO NOT HAVE POSTAL PICK-UPS TWICE A DAY  so please allow me IF needed an extra day or 2 to get to the Post Office.
l acquired a small lot of RARE railroad/railway related envelopes from 1917 of mostly defunct railroads. I bought all of these envelopes because I know how rare and unusual they actually are and I'm sure there is someone out there that appreciates the rarity and collects anything related to the subject above. Unless there is something unusual on the backs, I won't bother posting a picture of the backs.
I know RARE pieces like this from railways that may not have survived the 1900s don't come up to often if ever so I am hoping the right person will know that also?
PLEASE ask questions and do your research before you bid and BE SURE it is what you want so we don't have to go through the hassles and costs of returning. Thank you.