At the time of independence, there were 9 railway systems operating in India. How many were in Pakistan out of 9?

At the time of independence, there were 9 railway systems operating in India. How many were in Pakistan out of 9?

آزادی کے وقت ہندوستان میں ریلوے کے 9 نظام کام کر رہے تھے۔ پاکستان میں 9 میں سے کتنے تھے؟
Explanation

Rail transport in Pakistan began in 1855 during the British Raj

Pakistan Railways is the national, state-owned railway company of Pakistan.

Headquarter in Lahore.

it owns 7,791 kilometres of track across Pakistan,.