What's the difference between subway and Metro?

The differences are as follows:

1, meaning different.

Subway means: n. underground railway; Subway; (esp the Paris subway); Big cities, especially Delhi, Kolkata, Ma Kai or Chennai;

Subway means: subway; Subway traffic; Underground sidewalk (crossing the road, etc.)

2, the usage is different

Metro usage: usually used in the singular, usually written as theMetro.

Subway usage: refers to the subway or passage in the city, mainly used in the United States.

3. Different emphases

Urban focus: Woo present tense.

Subway focuses on-like present tense or-like past tense.