What ballast should I purchase for modeling UP mainlines in Utah? Perhaps a gray or limestone color? See this google map link: https://www.google.com/maps/@40.7409725,-112.1778733,3a,27y,202.58h,86.15t/data=!3m6!1e1!3m4!1swO3RxDiyacCdzdUlXdqPXA!2e0!7i16384!8i8192
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