Original sentence: After the commissioning of the train control system [Level 1], the top speed was increased in steps.After the stabilisation of the train control system [Level 2], the trains may cover the distance of 651 km between Madrid and Barcelona in about 2 hours 30 minutes, with a top speed of 330 km/h
Edited sentence: After the commissioning of the train control system Level 1, the top speed was increased in steps.After the stabilisation of the train control system Level 2, the trains may cover the distance of 651 km between Madrid and Barcelona in about 2 hours 30 minutes, with a top speed of 330 km/h