After hearing Thomas boast about his new coat of paint, the trucks mentioned they did not like black paint, so the Naughty Pink Troublesome Truck told the other trucks to be so naughty that they could get new coats of paint.
The Fat Controller explained that the black paint hid all the grime and dirt on them, but sent the truck to the works to be repainted pink. The Fat Controller later told him that the pink would wear off in the end.
The Naughty Pink Truck is based on a 7-plank open wagon.
The Naughty Pink Truck is painted black, but was later repainted pink temporarily.