Narrow gauge fanbois are jelly of standard gauge's increased stability at high speed.>>1157846
Australia, after the massive mistake of the colonies choosing three different railway gauges, is slowly working to make the interstate railways standard gauge. The standard gauge runs from Melbourne to Brisbane. The Murray Basin Rail Project will convert Victoria's northwest freight services from broad to standard gauge. Inland Rail (if a track alignment can ever be agreed upon and funded) will connect Brisbane to Melbourne removing the need to go through the mess that is Sydney. All of these projects will deliver economic benefit by removing trucks from the road and increasing freight capacity.
But not all gauge standardisation will survive a cost-benefit analysis. Russia has no incentive to move to 1435 mm gauge, for example. In some ways, arguing for a universal track gauge is akin to arguing that the whole world should decide which side of the right-of-way to travel on (Left Hand Traffic or Right Hand Traffic) - and the answer in both cases is we're too far gone to do anything about it.