Main Line railway track curvature lubrication: mechanical wayside grease pots on sharp curves?

The Main Line features exceptionally sharp curvature—down to 5-chain radius (100 meters)—climbing through the Central Highlands. Heavy diesel-electric locomotives rounding these tight bends generate intense friction between steel wheel flanges and the high outer running rail, producing piercing squeal and rapid side-wear of rail steel. To mitigate this, SLR permanent-way crews install mechanical wayside lubricators (grease pots) ahead of sharp curves. As train wheels pass, mechanical striker arms pump heavy high-pressure graphite grease onto the gauge face of the outer rail, where wheel flanges pick it up and distribute it smoothly around the curve.