I know it's 100% stereo types but I found it deep in my meme collection and wanted to share!
I mean, those bridges are exactly what I said - no maintenance.
Railroad traffic is also in bad shape due to the same reason: the infrastructure was neglected and not maintained over decades. Maintenance is not just repairing a broken piece of track or power line. Maintenance also includes modernisation, expansion and adapting to changing environmental factors, requirements etc.