【明報專訊】OVER the past few years, it has from time to time transpired that MTR services have to be suspended so that emergency repairs can be made because there is a "crack" in a rail. The MTR Corporation Limited (MTRCL) has often described what causes such accidents as cracks or fissures. About the accident Lai King Station saw the day before yesterday (November 2), it said at first a crack had been spotted in a rail. However, photos a source has given us show the rail in question was broken and displaced. On the face of it, the situation was much more serious than the MTRCL spokesperson has described. And trains passed through while the broken rail was being repaired. Because of the situation mentioned above, one has reason to harbour suspicions. Has the MTRCL downplayed the rail breakage accident? Has its decision not to suspend services put passengers in danger? Is it overload that often leads to rail accidents? These are questions worth looking into. Train services must be zero-risk. The government has a duty to require the MTRCL to answer the three questions truthfully.