The current rail reliability benchmark of 1 million mean kilometres between failure remains a "relevant and valid" target, said the transport minister. SINGAPORE: Raising rail reliability targets could come at a cost to taxpayers and commuters, said Transport Minister Chee Hong Tat. The current rail reliability target of 1 million mean kilometres between failure (MKBF) remains a "relevant and valid" target, he said in parliament on Monday (Nov 11). He was responding to a question by Leader of