The New Measurement Train (NMT), affectionately nicknamed the Flying Banana, is a specialised train which operates in the United Kingdom to assess the condition of track so that engineers can determine where to work. It is a specially converted InterCity 125, consisting of two Class 43 power cars and five or six Mark 3 carriages. It can check the condition of most main lines and some secondary routes operating on a four weekly cycle. This cycle replaced its original 13-week cycle after the introduction of the Plain Line Pattern Recognition (PLPR) Design Patrolling Program.

The Railway Technical Centre (RTC) in London Road, Derby, England, was the technical headquarters of the British Railways Board and was built in the early 1960s. British Rail described it as the largest railway research complex in the world.