My sister had a favorite book when she was about 3–1970. The book was thin and tall with a green cover and we think it was titled “The Two Little Princes”. The story is about 2 little princes who have everything in the world, but won’t share and still want more. Their nurse/ nanny decides to take away all of their toys and leave them in an empty room by themselves. Finally she brings in a basket with a single train track, one blue train and one red train. The have to work together to make the track and then play together with the trains.
The drawings were simple without much color and the nurse wore a white hat with an apron.