• 鉄道てつどう — railway
• 鉄橋てっきょう — iron bridge
• 鉄板てっぱん — iron plate
• 地下鉄ちかてつ — subway
• 鉄分てつぶん — iron content
• 鋼鉄こうてつ — steel

The kanji 鉄 uses the radical 金 (かね) which represents metal, and is paired with the phonetic 哲. It refers to iron — a fundamental material in construction, tools, and transport. Its compound words often point to strength, durability, or industrial use.