Marty,
After a few minutes searching, I found on
John's Alaska Railroad Web Page, your answer. Alaska Railroad's radio frequencies: Ch. 1, road 164.625; Ch. 2, dispatcher, 165.335; Ch. 3, yard, 165.265; Ch. 4, alternate, 164.985. This came from John's page
Riding and Photography, about 2/3rds down the page under "Good Photography Locations." John Comb's site is very comprehensive with history, rosters, news, links, etc abour The Alaska Railroad.
What are you going to be doing there? I'll also be in the area June 16 through June 21. My web site has several thousand Alaska RR photos. Check it out.
I hope this helps.
Richard Elgenson
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www.trainweb.org]