Better rails

🚂 Copper Rails — High-Speed Rail Rework

Rails are now made primarily from copper instead of iron, introducing new progression mechanics and speed dynamics.

🧪 Rail Oxidation = Speed Decay

Each rail type has four copper states (fresh to fully oxidized), just like copper blocks.
These states directly affect the maximum speed of minecarts:

🔩 Regular Rails, Detector Rails, Activator Rails

• Max Speed: 64 m/s (fresh copper)
• Speed Loss: −16 m/s per oxidation level
  (e.g. down to 16 m/s when fully oxidized)

⚡ Powered Rails

• Now crafted using copper rails + iron ingot
• Max Speed: 32 m/s (powered)
• Speed Loss: −8 m/s per oxidation level

🧭 For comparison: vanilla rails = 8 m/s, elytra flight ≈ 32 m/s

🌟 New: Self-Powered Rails

A new rail type crafted with gold:

• Always powered — no redstone needed
• Max Speed: 64 m/s
• Can power adjacent powered rails
• Ideal for high-speed rail networks

🔜 Planned Features

• 🚀 Faster furnace minecarts
• 🔄 Wall- and ceiling-mounted rails

This mod lays the foundation for a more dynamic and realistic minecart system, where material condition and rail types matter.