Monorail Cat is a classic internet meme featuring a cat resting on a railing or narrow surface with its legs tucked underneath, mimicking the appearance of a monorail train. The original image dates back to around 2006 on sites like 4chan and became a cornerstone of the 'lolcat' phenomenon. It exemplifies the early internet's fascination with 'cat loafing' and wordplay, often accompanied by captions about train schedules or being 'out of service.' While it originated nearly two decades ago, Monorail Cat remains a nostalgic symbol of the early social web and the simple, innocent humor that defined the first wave of viral animal content.