reporting marks

Any historical questions can be posted here. Answers would certainly help as well :)
GAP
Railroadfan...fan
Posts: 239
Joined: Tue Mar 14, 2006 9:06 pm
Location: Portage MI

reporting marks

Unread post by GAP »

When did reporting marks get shortened to no more than four letters? When did MSP&SSM become SOO or NYC&SL become NKP, etc?

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