Railroads don’t mess around when it comes to infrastructure upgrades. When bridges get replaced, they are often replaced with long-term solutions that will serve the railroad well into the future. Each bridge is a very small piece of an expansive system, however if it has to be taken out of service, the entire line may be shut down. Trains would have to be re-routed, time would be lost, and costs would go up. This is why in an expanse network of rail infrastructure; each bridge is a crucial piece.