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Hi Ron, I can't answer your question because I haven't put down LGB track. But the bigger question is why are you worried about expansion? Is that because you live in an area that has great temperature fluctuations? If so you should mention what area you live in. There might be people reading this who live in the same area as you and are able to tell you if expansion has been a problem for them, and what they have done to get around it. Glen.
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