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Visitors since January 13, 2025

The three red circles mark where the signs indicating the beginning of a subdivision are. I labeled these spots "Dividing Lines." Dividing Line MT1 is straightforward, both signs are mounted back-to-back on the same post. There are two dividing lines on main track two, separated by approximately two tenths of a mile. (Highlighted in red on the map.) Dividing Line MT2 Eastbound marks the start of the Roseville Subdivision for eastbound trains. Dividing Line MT2 Westbound marks the start of the Martinez Subdivision for westbound trains. The Valley Subdivision begins or ends (depending on a train's direction) a little to the east of Dividing Line MT1 where the west leg of the wye meets main track one of the Roseville Subdivision.
Map data from OpenStreetMap. The bright red data is by DonJr.
References: Google Maps satellite and aerial images, Union Pacific Roseville Area Timetable #8, and my own photographs.