[1] The aim was to rejuvenate the once flagging format and provide enticing rewards for cyclists during the road cycling off season.
[2] In January 2019, an event in Hong Kong was announced as a new stage to introduce 6-day racing to Asia.
The success of the madison format in the United States led to their introduction in Europe.
Its heart was in Germany - except during the Nazi period when the races were banned - but it was strong, too, in Belgium and France.
In 1923 the journalist Egon Erwin Kisch attended the tenth staging of the Six Days of Berlin and wrote a celebrated piece "Elliptische Tretmuehle" (Elliptical Treadmill).
Today, the 24-hours-a-day regime has been abandoned, with the Six Day format involving six nights of racing, typically from 6pm to 2am, on indoor tracks (velodromes).
Hong Kong was added between the Melbourne and Manchester races in the latest update during January 2019.