How do they make C30-7 trucks 1600 mm / 5'3" in Brazil, are there picture to illustrate the process?

Trains Magazine Locomotives
3

You have asked the question before:

http://cs.trains.com/trc/f/1/t/219163.aspx

We have at least one, probably more Brazilian. Maybe one of them will see your question can give you a satisfactory answer.