Looks like this renovated railroad right-of-way has recently opened for the urban hike-and-bike crowd:
http://www.dallasnews.com/sharedcontent ... 05bd6.html
If you go to the website of the Friends of the Santa Fe Trail you can view a map of the trail. At the north end it starts at White Rock Lake. Actually it uses part of SP's Belt Line. At the south end, it will make a T using the old T&P mainline. Part of the T will segue into Fair Park.
Once completed, you can walk or bike on four different railroad roadbed segments:
1) Katy's White Rock spur (not officially part of this trail)
2) Belt Line (SP)
3) Santa Fe (Dallas-Paris) line
4) old T&P mainline
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