 The passengers who were most severely injured or killed were seated in coaches with wooden frames.This structure was incapable of surviving a high-speed crash and did not come near to the safety standards provided by modern (post-1950s) metal-body coaches.The expert bodies that reviewed that accident discovered that the old timber-frame carriage bodies mounted on a steel frame were totally inadequate as they were prone to complete collapse (the "accordion" effect) under the enormous compression forces of a high-speed collision.