 The Big Hill Tunnel, located between Kangaroo Flat and Ravenswood, south of Bendigo.Like the Elpinstone Tunnel, it was double-tracked when built, but was singled as part of the Regional Fast Rail project.Cheviot tunnel was built for the extension of the Mansfield railway line from Yea and is located near Limestone, roughly halfway between Yea and Molesworth, where the line crosses the Black Range at McLoughlin's Gap.