What does the railway "one block and three guarantees" mean?

Resist disasters and ensure smooth transportation and safety. Railways are the tracks of trains and other means of transportation. The railway has the work of "one resistance and three guarantees", which is to resist disasters, ensure smooth flow, ensure transportation and ensure safety. We will spare no effort to ensure the safety of people's lives and property, minimize the losses caused by severe weather disasters, maintain social stability, and promote sustained and healthy economic and social development.