The Ministry of Railways is the only institution directly under the State Council with both official and commercial status. It is not only a central government agency, but also a commercial operation department.
The Ministry of Railways didn't have enough money to develop railways, so of course it borrowed money from banks.
Although they are all state-owned, as different units, the financial relationship between them is still independent! If you borrow money, the account should still be clear! Brother, settle the accounts, they are not brothers, they all have their own interests!
However, in the end, as you doubt, how much money the Ministry of Railways owes is not a big problem, because in the end it is still the country! And who will pay for the country? We!