Each of those stations were probably bid separately and went to different Sub-contractors. Could the city have gone to just one Sub? Yes. But there are multiple factors that could stop that from happening. MBWE requirements or bonding and insurance requirements that are based on the value of your work vs the worth of the company.

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Could the city have used one manufacturer and saved 5-10%? maybe; but these other regulations for minority/women/small businesses would need to go away.