#robot trains

Is it just me, or are Johnny and Sharon similar in color?

Also, Alf and Selly are similar in their shape (it is because of this that I began to consider them brother and sister)

And it seems to me that Janne and Stella are also similar in shape

Mos and Dos are also like twin brothers (although it seems to me that Train X created them himself, that’s why they are so similar I guess)

Genie and Maxie also have a similar shape

Kay and Maxie seem to have family ties (like siblings, again)

Could this mean that they are related to each other? (if trains of course have such a thing as a family). Or maybe some trains were created together at the same factory, so they are so similar?