Rail chiefs are pressing for a definite opening date for Chek Lap Kok airport before deciding whether to commit resources to speeding up track work. The call is a further blow to the Airport Authority's scheduled April launch. It had been assumed the MTRC would speed up work to open two months earlier than its June pledge. MTRC chairman Jack So Chak-kwong said yesterday no decision would be made on the issue until a specific opening date was announced. An acceleration would require a massive investment in resources, he said. 'We realise the importance of opening together with the commencement of the airport but that will require a major decision on investment for speeding up the works - we have to be really sure of the opening date before we make that particular decision,' he said. The rail link is intended to transport about 40 per cent of all passengers using the airport. Chaos is feared if the openings do not coincide. Airport Authority chief executive Hank Townsend said last week the final opening date would not be decided before the authority met the Government in September. A Transport Bureau spokesman said yesterday the Government could not step in until it received an opening date from the authority. Transport experts said the confusion would probably leave the opening date of the railway 'up in the air' for several more months. Democratic Party infrastructure spokesman Albert Chan Wai-yip supported the MTRC, saying it was very clear the airport would not be ready in April. 'Of course, everyone wants it opened early but concentrating on June is more realistic,' he said. 'I see no reason why the MTRC should spend more money to speed up. I think the authority and the Government should instead be more forthcoming in telling the public what is going on.' The April opening has been called into question in the wake of construction problems on the cargo terminal. Mr Townsend said progress on the terminal, known as SuperTerminal 1, would play a 'very critical role' in deciding a final opening date for the airport. Analysts have said the airport would almost certainly not open on time unless the cargo terminal was ready. Officials from the authority had until recently been adamant about an April opening.