鐵

surname Tie

iron (metal) / arms / weapons / hard / strong / violent / unshakeable / determined / close / tight (slang)

subway / metro

subway station

a magnet / same as 磁鐵|磁铁

triangle (musical instrument) / angle iron

JingJiu (Beijing-Kowloon) railway

Beijing-Harbin railway

Jing-Guang (Beijing-Guangzhou) Railway

Beijing-Shanghai High-Speed Railway, completed in 2010 / abbr. for 京滬高速鐵路|京沪高速铁路

one can't function properly on an empty stomach (idiom) / an empty sack cannot stand upright

razor wire

Canadian Pacific Railway

If you work at it hard enough, you can grind an iron bar into a needle. / cf idiom 磨杵成針|磨杵成针, to grind an iron bar down to a fine needle (idiom); fig. to persevere in a difficult task / to study diligently

subway

Eiffel Tower

rapid transit system / urban railway

Union Pacific Railroad

ferric chloride FeCl3

triathlon (Tw) / (athletics) throwing events excluding the hammer throw (i.e. discus, javelin and shot put)

stainless iron

ferrous