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Just patiently solder it... Don't hold the heat on too long, and don't let the parts move until they cool. I have a whole layout that is completely soldered, yards, industry, mainline, and all. It just takes practice, patience, flux, and good solder. (I use a 30 watt iron, and melt the solder on the iron first, then let it flash on the flux on the outside of the rails. If you want, wet paper towles, and / or heatsinks 1/2 inch on either side of the solder joint will keep anything from melting. We aren't trying to "weld," just get the solder to rush onto the rails, flatten out, and cool in place. It will have a good connection if the rails were clean, the flux was acid free paste, and the solder was a resin core. Again, the solder seems to be holding up fine here. I will caution you that in curves and such, the track must be glued to the roadbed to keep it from popping outward, but I have had the same problem with rail joiners in the past.
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