I fondly recall several old PCC streetcars on the Boston E line with gaping rust holes in the front aprons, all crudely masked with silver duct tape by MBTA mechanics making probably $50 an hour. They finally scrapped or sold off most of their fleet, to be replaced by Boeing-built LRVs which promptly started rusting rapidly. No duct tape appeared, though, since the cars broke down early and were again scrapped before the rust penetrated inside.