About The first section opened between Lismore and Murwillumbah, connecting the Richmond and Tweed rivers. Passengers and goods were transported to Sydney by coastal shipping from Byron Bay. Nine years later, an extension from Lismore to Casino opened (and later south to Grafton - it was not until 1932 that the line was fully connected to Sydney). As early as 1889, feasibility talks took place into extending the line north from Murwillumbah into Queensland, discussions that continue to the present day. The line became a branch line when in 1930, the North Coast Line was extended from Kyogle to South Brisbane. The total distance would be around 54.7 km (33.9 mi). I believe setting this route in 1980's would be good Rolling stock New South Wales 620/720 class railcar New South Wales 44 class locomotive New South Wales 48 class locomotive New South Wales 442 class locomotive
You mean trying to extend this all the way to the state border at Tweeds Head and Excellent idea. Oddly these locomotives can layer to 1980s Main South line Liverpool to Sydney central station via Granville predating the 1990s junction configuration for Cumberland Line
