SERIOUS railway accidents often have repercussions well beyond the immediate cause. Their rarity - reflecting the generally high standard of railway safety - usually points to some wider deficiency. This is certainly the case with the fatal crash near Wenzhou, China, on July 23. The world’s first fatal accident on a dedicated high-speed line was bound to attract attention, but it came only three weeks after the opening of the world’s longest high-speed railway, the 1318km Beijing - Shanghai line, which itself has been the subject of significant press reporting due to poor reliability.