North West. Concern over link's tunnels

When tunnels for the North West Rail Link are finished in just over four years, they will have an internal diameter of about 6.1 metres, too small for the type of trains used in Sydney, according to the Sydney Morning Herald. The Transport Minister, Gladys Berejiklian, said the decision to bore smaller tunnels was not about saving money. But the commitment to smaller tunnels has sparked fears among some transport planners that, for the sake of a few centimetres on either side, the government could be forever locking off transport options. This is because the size of the tunnels may not affect only the type of trains that use the North West Rail Link.