Welcome to The Cove!
I am confused.
You say you are working with manufacturing engineers in a company that does road construction, and you want to find out what a "certified world class" assembly line workcenter would look like (how it would be defined).
What does your workcenter assemble?
Do you assemble it while doing road construction at the road worksite, or does the assembly occur in a building and get shipped to site?
What standard would you be interested in certifying to?
Do you do work for military, nuclear, aerospace or other customers with specific requirements?
The iconic World Class system would have to be Toyota, and to my knowledge this company has never certified to any ISO standard. Here is a thread discussing the subject:
Toyota & ISO 9001 - Toyota Production System (TPS)