I have acquired several large bags of LEGO - most are the tradition bricks, but what kit are these (see photo) rail-type pieces from? They are identified on the reverse with a letter, such as "E", and a 1 or 2-digit number. Some of the rails contain small teeth the entire length - some are smooth.
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2Related: What different types of train tracks exist – Uli Sep 27 '20 at 18:50
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That gear doesn't look like Lego at all. But those rails where the normal rails in the 70's – Tonny Sep 29 '20 at 14:32
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@Tonny , The gear is part # 743 :Technic, Gear Samsonite 35 Tooth – Syberion Oct 2 '20 at 21:51
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@Syberion Interresting... The early Technic gears I'm familiar with are from the 70's. The red (small) , blue (medium) and yellow (big) ones with the white axles. Seems these are even bigger. I had never seen them before. – Tonny Oct 3 '20 at 11:57
The rails with the "small teeth" are
Part No: 3230a , Train, Track Tapered Rail Curved Inside
Part No: 3229a Name: Train, Track Tapered Rail Curved Outside