The series switched to colour in 1972 and Rita had a baby son, Michael.

There were a total of thirteen books after the series switched to that format.

Initially releasing the shows on CD, the series switched to a digital distribution system in 2011.

Initially produced in black and white, the series switched after one season to full color.

The series started as a fleet race and then switched to match racing.

The series began in black-and-white, and only in 1966 switched to color.

The series switched to color for the second and third seasons.

The series began in black-and-white but switched to color for the fall 1965 season.

For the following year the series would switch to the Supertouring formula.

The series then switched to a 15-minute format, producing 125 episodes that aired weekdays through June 27, 1952.