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A ballast undercutter comprising an undercutter portion (57) for excavating ballast material from a ballast bed and a conveyor portion (59) for conveying the excavated ballast material to a discharge zone (73). The ballast undercutter material and endless chain structure (61) adapted to move along a

A ballast undercutter comprising an undercutter portion (57) for excavating ballast material from a ballast bed and a conveyor portion (59) for conveying the excavated ballast material to a discharge zone (73). The ballast undercutter material and endless chain structure (61) adapted to move along a path (63) which includes the undercutter portion (57) and the discharge portions. The endless chain structure (61) defines part of the undercutter portion (59) and the endless chain structure (61) further defines part of the conveyor portion (59). The endless chain structure (61) comprises a plurality of chain part is (81) interconnected for pivotal movement one with respect to another. Each chain part pivotally connected to an adjacent chain part about a respective one of three axes, being a first pivot axis (85), a second pivot axis (99) and a third pivot axis (103), wherein the first, second and third axes are substantially perpendicular to the longitudinal extent of the chain structure (61). The first and second axes (85, 99) are substantially parallel and the third axis (103) is substantially perpendicular to the first and second axes.

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