Which country operates second largest public railway network in South Asia?

Which country operates second largest public railway network in South Asia?

کون سا ملک جنوبی ایشیا میں دوسرا سب سے بڑا پبلک ریلوے نیٹ ورک چلاتا ہے؟
Explanation

Pakistan has nearly 80,000kms in South Asia.

The current railway network in South Asia comprised of four countries: India, Pakistan, Sri Lanka and Bangladesh