Scheduled preventive maintenance of any type of heavy equipment is the same, the type of industry does not matter. The type of maintenance is obviously different, but maintenance is still maintenance. You perform preventative maintenance so you don't have a major problem down the road that will cause your equipment to go out of service. Out of service equipment does not generate any money for the operator. Companies look at the reliability of components, talk with the manufacturers and other operators and look at what is trending throughout the industry. This is accomplished so companies of any type can keep their equipment up and running. An idled piece of equipment does not make money for any company, be it airlines, railroads, trucking, shipping, or mass transit. It was scheduled preventative maintenance that kept this piece of equipment running for 44+ years. While you may not see an overhaul as preventative maintenance, it is scheduled preventative maintenance. I've worked for airlines, mass transit, trucking and scheduled bus lines, and preventative maintenance is always scheduled maintenance, hence the overhaul. What you call a "re-manufacture" is in fact an overhaul. The company installed components with greater reliability that would have a longer MTBF, upgraded other components with newer technology and standardized whatever systems they could that were in the realm of what the equipment could handle. Most companies do that during an overhaul if it's cost effective and will improve reliability of the piece of equipment while in service. When something fails, whether it be inflight or on the ground, the equipment is still idled and does not make the company any money, that's the bottom line, MONEY, not nostalgia. Do you honestly think NS kept this engine in service after they inherited part of CR because of nostalgia??? Scheduled preventive maintenance. And for the record, aircraft just don't "fall" out of the sky due to a parts failure. I won't even begin to get into that discussion.