Here’s a few samples of pages from the 1961/62 “World Railways” published by Sampson Low. The directory was published from the early 1950’s until the late 1060’s when it was taken over by Jane’s publishing, and still continues as Jane’s World Railways. This copy is from the British Rail Technical Library in London.
The directory gives data, maps and loading gauges of different countries railway networks, along with various preiod adverts. Interesting to see the map of China’s railways, the route mileage in 1961 was 20,000 compared to todays 75000!