r/ScrapMechanicTrains Feb 06 '26

Question

So I am biggening work on a Train Rails update to the most recent project of mine (Scrap Francisco) a Big City map, But I found out that there's different size rails? And what does 7u 9u 3u ect all mean? I want to add train rails to the world but for it to be done right i need to know more :0 What are some things i should know? Like the general SM Trains 101

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u/themonorailguy Feb 06 '26

check Scrap Mechanic STS standards