The line has several other significant pieces of infrastructure, including both the oldest structure and the longest brick arch viaduct on the New South Wales railways.

[2][4][5] The heritage-listed Pyrmont and Glebe railway tunnels, built in 1922, continue to carry the light rail on opposite sides of the Wentworth Park viaduct.

[6] The railway cutting through Pyrmont goes from the commencement of Jones Bay Road, where the line deviated from the subseqeuntly-removed wharf sidings, through the current location of the John Street Square light rail stop.

[2][13] With conversion to light rail, the line was truncated at Dulwich Hill, though it previously connected there through to the rest of the Sydney goods network through the triangular Wardell Road Junction.

[16] It was decided to construct separate goods lines from Sefton to Darling Harbour via Enfield, Dulwich Hill and Rozelle, with extensions to Botany and the State Abattoirs at Homebush Bay.

[18] Initial traffic was spoil for the construction of the Main Suburban line between Sydney and Parramatta, then for the carriage of departmental coke for steam engines, and a small amount of timber from 1860.

Initial reports of the traffic on the line suggested that freight revenue amounted to only £20 a year, and there was only 60 tonnes of coke carriage a week.

[21][19] When the light rail was initially conceived, grain was still being transported along the line to Pyrmont, and so planning was undertaken with the presumption that this would continue.