Legislative Council Fifty-Second Parliament, First Session (52-1) 52 1 Parliament of South Australia Legislative Council published Answers to Questions Northern Suburbs Bus Routes NORTHERN SUBURBS BUS ROUTES The Hon. D.W. RIDGWAY Legislative Council Leader of the Opposition NORTHERN SUBURBS BUS ROUTES In reply to the Hon. D.W. RIDGWAY (Leader of the Opposition) (3 December 2009). The Hon. G.E. GAGO Legislative Council Minister for Regional Development, Minister for Public Sector Management, Minister for the Status of Women, Minister for Consumer Affairs, Minister for Government Enterprises, Minister for Gambling NORTHERN SUBURBS BUS ROUTES The Hon. G.E. GAGO (Minister for Regional Development, Minister for Public Sector Management, Minister for the Status of Women, Minister for Consumer Affairs, Minister for Government Enterprises, Minister for Gambling): The Minister for Transport has been advised: 1.	The Port Adelaide Viaduct upgrade has been designed with future gauge conversion in mind. Broad gauge sleepers have been used at this stage because of the complex rail arrangement which requires the use of 'check' rails. 'Check' rails are a second rail that sits inside the running rail to minimise the risk of a derailment on bridges. When the line is standardised, the sleepers will be replaced with standard gauge check rail compatible sleepers. The broad gauge sleepers removed will be able to be re-used in other broad gauge environments.