Eleborate the history of the blue train including the origin, important dates and stages of development and the latest innovation.

Blue Train is an upper class train (and a known elite train in the whole world) in South Africa travelling from Pretoria to Cape Town and vice versa. Its history began in 1923 connected to Union Limited and Union Express trains which began in 1923. In 1947 (World War II), it stopped its services and resumed on 1997.