城铁

Traditional form:

城鐵

Pinyin (reading):

chéngtiě

Definitions:

• rapid transit system
• urban railway

Characters:

• 城 - castle, city, town; municipality
• 铁 - iron; strong, solid, firm

Traditional characters:

• 城 - castle, city, town; municipality
• 鐵 - iron; strong, solid, firm