These items are one of the key parts in all rail recipes, alongside the Railbeds. If the Factory module is installed, they are crafted at the Rolling Machine, but otherwise they are crafted at a standard workbench using the same recipes.
If you would prefer not to use Railcraft's style of recipes, you can disable them in the railcraft.cfg file. Just set the "tweaks.rails.useOldRecipes" tag to true.
Note: These recipes are made with a Rolling Machine and not with a crafting table.
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