Way History: 198573828

adding some start dates to western tracks and trunks without start dates so they don't appear in earlier maps

fixme	aribtrary start_date of 1846 added to match start of Mormon Trail operations; needs checking
highway	trunk
source	Topo
start_date	1846-02-28
start_date:source	arbitrary
surface	unpaved

Oregon Trail additions and date changes

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