Sixteen's Friends

Bio
When Sixteen worked at the Steelworks, he worked with some other industrial tank engines who were described by Wilbert as his friends. Unlike Sixteen, they obeyed the rules and never went beyond the 'DANGER' notice at the Tip. They tried their best to warn Sixteen not to go beyond the 'DANGER' notice, but to no avail.

Appearances
Sixteen's Friends were never seen in the illustrations. However, they had a speaking role in Wilbert the Forest Engine.

Livery and Names
Presumbly as Sixteen was painted brown-red with yellow stripes and only had a number for a name, his friends were also painted brown-red with yellow stripes, and each had a number for a name too.

How many friends did Sixteen have?
There was no mention on how many industrial tank engines worked with Sixteen at the Steelworks, so it is guess-work on how many friends he had.