"Central Air Conditioning," "Permanent Shock Absorption," "Medical Cabin."
These three yellow-grade vehicle accessories are optional for Level 3 trains. He crafted them all while on the Tieling Wasteland, but due to insufficient iron ore, they were never upgraded.
Yellow-grade vehicle accessories require 45,000 units of iron ore to upgrade from Level 1 to Level 10. This is considerably more expensive than white-grade accessories, which typically require only 4,400 units of iron ore for the same upgrade.
After consuming 45,000 units of iron ore.
The "Central Air Conditioning" yellow accessory quickly reached Level 10 and gained two supermodel effects!
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"Central Air Conditioning Level 5 Supermodel Effect": Halves energy consumption.
