1. Small Subway Trains: These typically have a capacity of around 1,000 to 1,500 passengers, spread across several cars.
2. Medium-Sized Subway Trains: These can hold anywhere from 1,500 to 2,500 passengers.
3. Large Subway Trains: These trains have a capacity of 2,500 to 3,500 passengers or even more.
It's important to note that these figures are approximate and can vary significantly based on factors such as train design, seating configurations, and the number of standing passengers allowed. Additionally, different countries and cities may have different standards for passenger capacity, so the actual capacity of a subway train may vary even within the same country or region.