Railcraft 12.0.0
Minecraft 1.12.2

Also have buildcraft, industrialcraft. Not forestry.

Been through the railcraft source and this does not result in a recipe working. I've tried with blockIron and ingotIron. You can make standard rails, mauls, crowbars, rolling machines, track and ties, railbeds... so some railcraft recipes are working.

I tried the wiki but there's no recipes for track kits documented. It seems that the "track kit" idea isn't documented anywhere as to what to do to make it work. There's some videos but they're in creative which means they didn't have to craft anything.

mc-1.12.2/src/main/java/mods/railcraft/common/blocks/tracks/outfitted/TrackKits.java
case BUFFER_STOP:
CraftingPlugin.addRecipe(output,
"I I",
"I#I",
"IbI",
'I', railStandard,
'#', woodRailbed,
'b', "blockIron");
break;

"Track parts" must be made in a rolling machine

Then kits to transform tracks in the various types are made using these "Track Parts"

Note this is not what's on the railcraft wiki - I think this new way using Track Kits is not what the documentation says, I had to use JustEnoughItems to work out what the recipe was. Or is there a new wiki somewhere?