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The Medford-Prentice line was built by the Wisconsin Central Ry. The Soo Line leased the original WC in 1909 and merged it in the 1960's. The line was used as the Ashland div main until 1985 when the Soo purchased the Milwaukee Road. At that time, all trough traffic for Prentice north was routed over the Milwaukee Rds Valley Line. All of this was sold to the new Wisconsin Central Ltd. The WC abandoned Medford - Prentice in the late 1980's.
There was apparently an east-west line that used to go through Belleville, WI, according to my Cousin, as well as the line that went north to Madison and south to Freeport. Are you aware of this, and where the ROW may have gone? I remember crossing a track in Dayton, to the east when I was a kid. I wonder if it wound-up in Beloit and joined with the line that ran to Milwaukee along I-43? I have no clue where it would have gone to the west. Perhaps through Barneveld and points west?
This line is now the Pine Line rec trail, I've snowmobiled it many, many times. Goes from Medford north through Wittlesey, Westboro and Ogema before reaching Prentice. There are still tracks at Prentice north to Ashland and East to Tomahawk. The tracks West to Ladysmith are still there, but will be removed shortly.
A majority of all northern Wisconsin trackage now belongs to Canadian National. The rails in both city's end in a thick wooded covering. You can research all trackage by using Google maps and following the points between cities.