Rosin core has flux in the solder. You can use stand alone flux if you want, just make sure its the electronics stuff and not acid flux for plumbing. If its not sticking there could be oil on the rail or the iron isnt transferring enough heat. Those soldering stations for electronics are great for electronics, but they dont have the outright power thats needed for soldering track. I've never had issues soldering on tubular so long as it was clean. A wipe with alcohol or acetone would help. So would a wire wheel in a dremel. Try soldering a bit of straight solder onto the rail without the wire. Then tin the wire, put the wire on the spot on the rail and apply heat. Once the solder melts you're just joining solder to solder.
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