What is a key requirement after conducting a Light Engine Running Air Brake Test?

Completing the test documentation is essential because it ensures that there is an official record of the light engine running air brake test. This documentation serves multiple purposes: it confirms that the test was performed, details the results, and provides a reference for future safety audits or inspections. Accurate records are vital for maintaining compliance with safety regulations and protocols, as they verify that the air brakes meet operational standards before the train proceeds on its journey. This is necessary for accountability and safety assurance within the operations of railway transport.