The crafting recipes of rails (any kind) do not appear in the redstone section of the recipe book. Instead, they will appear in the miscellaneous section.

Steps to reproduce:
1: Execute the command /recipe give @s *
2: Place down a crafting table
3: Open up the recipe book and then select the miscellaneous tab (the lava bucket and apple icon)
4: All rail types will be there, and not in the redstone section