Between 1900 and the 1960s, the line formed an important connection from Norwich, Cambridge and eastern England to Northampton and the Midlands. The line was generally acknowledged to be a secondary main line and frequently saw large engines such as Black 5s and B1s. However, the NVR was one of the last passenger line closures of the Dr Beeching era, services to Northampton and Rugby having ceased in 1964 and 1966 respectively. It remained open until 1972 for freight traffic only.