A track chain member comprising: a shoe member ; and a first rail member extending from the shoe member , wherein the first rail member includes a first lug defining a first bore defining a first longitudinal axis (L210), a second lug defining a second bore defining a second longitudinal axis (L216), the first lug and the second lug extending parallel and spaced apart from each other with the first longitudinal axis (L210) aligned with the second longitudinal axis (L216), forming a female yoke ; and a third lug extending in a direction opposite that of the first lug and the second lug , the third lug defining a third bore defining a third longitudinal axis (L224) parallel to the second longitudinal axis (L216); wherein the third lug is disposed axially between the first lug and the second lug along the third longitudinal axis (L224); characterised in that the first lug includes a first bushing retention shelf disposed in the first bore , the second lug and includes a second bushing retention shelf disposed in the second bore and the third lug includes a third bushing retention shelf disposed in the third bore , the first bore , the second bore and third bores have cylindrical configurations defining a first radial direction (R210) of the first bore , a second radial direction (R216) of the second bore , and a third radial direction (R224) of the third bore , and the third bushing retention shelf extends radially the same amount (RD226, RD218) as the second bushing retention shelf while the first bushing retention shelf extends further radially (RD212) than the second or the third bushing retention shelves . a shoe member ; and a first rail member extending from the shoe member , wherein the first rail member includes a first lug defining a first bore defining a first longitudinal axis (L210), a second lug defining a second bore defining a second longitudinal axis (L216), the first lug and the second lug extending parallel and spaced apart from each other with the first longitudinal axis (L210) aligned with the second longitudinal axis (L216), forming a female yoke ; and a third lug extending in a direction opposite that of the first lug and the second lug , the third lug defining a third bore defining a third longitudinal axis (L224) parallel to the second longitudinal axis (L216); wherein the third lug is disposed axially between the first lug and the second lug along the third longitudinal axis (L224); characterised in that the first lug includes a first bushing retention shelf disposed in the first bore , the second lug and includes a second bushing retention shelf disposed in the second bore and the third lug includes a third bushing retention shelf disposed in the third bore , the first bore , the second bore and third bores have cylindrical configurations defining a first radial direction (R210) of the first bore , a second radial direction (R216) of the second bore , and a third radial direction (R224) of the third bore , and the third bushing retention shelf extends radially the same amount (RD226, RD218) as the second bushing retention shelf while the first bushing retention shelf extends further radially (RD212) than the second or the third bushing retention shelves . <EOS>