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The meaning represented by rail models

2015-08-13View Original

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Gentlemen, regarding the tracks for trains, what do QU and QU80 mean, where QU stands for something in this context? The material of QU70 rails is U71MN; what does the U in U71 represent? For light rails such as those with gauge 18, the material used is 55Q. What does the letter Q in 55Q stand for? Seeking advice, thank you!

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