Have a 75 foot layout. Bought some new 10 inch straight track, some used 30 inch track and some used 036" curves and had a loop that came with a train set. Decided for smooth and constant voltage to solder all tracks together with 60/40 rosin core electrical solder and 16 gauge speaker wire. All new 10 inch track soldered together with no problem. 10 inch track that came from a train set and curves would not take solder. All used 30 inch track took solder and a few curved sections did as well. I am stumped as why some Fastrack soldered with no problem and others would not. Any ideas?
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