How is a train manufactured?

To guarantee the train’s performance and the security of the passengers, several stages of production and
tests are necessary before entry into service:

When a train is manufactured, numerous steps are required before entry into service: studies, full-scale design models and aerodynamic tests, manufacturing train components, traction chain tests, testing elements for crash simulation, fabricating and testing the structure, painting, window and floor installation, cable assembly, installing interior equipment, electrical tests, placing the body onto the bogie, train assembly, loading the on-board software, static tests followed by dynamic tests in the factory and, finally, tests on the customer’s lines.

More information - Train life