On the Railway takes readers through South Africa's rich railway history, from Estcourt to the grand steam engines on narrow gauges. David Williams highlights luxurious trains like the White and Blue Trains, and the vital role of goods trains in the economy. He explores engineering feats that tamed tough terrains and the growth of railway towns. The book also addresses racial segregation, the decline of the rail network, and reflects on the past and uncertain future of South African railways.