I believe there are some misnamed items in the en_us localization:

• Lead Raw (Line 551)
• Nickel Raw (Line 559)
• Silver Raw (Line 583)
• Tin Raw (Line 616)
• Zinc Raw (Line 637)

Instead they should be named:

• Raw Lead (Line 551)
  "item.railcraft.lead_raw": "Lead Raw", (Current)
  "item.railcraft.lead_raw": "Raw Lead", (Changed)
• Raw Nickel (Line 559)
  "item.railcraft.nickel_raw": "Nickel Raw", (Current)
  "item.railcraft.nickel_raw": "Raw Nickel", (Changed)
• Raw Silver (Line 583)
  "item.railcraft.silver_raw": "Silver Raw", (Current)
  "item.railcraft.silver_raw": "Raw Silver", (Changed)
• Raw Tin (Line 616)
  "item.railcraft.tin_raw": "Tin Raw", (Current)
  "item.railcraft.tin_raw": "Raw Tin", (Changed)
• Raw Zinc (Line 637)
  "item.railcraft.zinc_raw": "Zinc Raw", (Current)
  "item.railcraft.zinc_raw": "Raw Zinc", (Changed)