Simplify the following text for a Grade 7 native English-speaking person.
Original: A Rail Accident Investigation Board report stated that the derailment was due to wear and tear on the track with a contributory factor being the new type of running gear on the two-car prototype .
Simplified: A Rail Accident Investigation Board report said that the derailmet was because of wear and tear on the track . They said another factor was the new type of running gear on the two-car prototype .