However , the drastic downsizing of Pietrarsa 's labour force continued until only 100 workers remained .
A locomotive for freight trains built at Pietrarsa earned a gold medal at the 1873 Vienna World 's Fair .
The drastic downsizing of Pietrarsa 's labour force continued until only 100 workers remained .
A locomotive for freight trains built at Pietrarsa earned a gold medal at the 1873 Vienna World 's Fair .