Watch London Rail Ridership Explode in This Interactive Map

Maybe you don’t need a data visualization to know that the U.K.’s rail system is growing at an awesome and almost troubling rate. According to a report unveiled by a Freedom of Information Act request, Network Rail, which handles most of the U.K.’s rail infrastructure, expected 3 percent annual passenger growth in the London area for the next five years. Instead, it got 8 percent in just the first nine months of 2014. The result is packed cars, squeezed platforms, and delayed trains, particularly during the morning rush.

Still, actually seeing 2.75 billion passenger trips between 2014 and 2015—the highest figure ever, according to the Office of Rail and Road—is believing. And the effect is particularly staggering when you note, as the advocacy group Campaign for Better Transport does, that the passenger rail saw just 1.3 billion trips between 1997 and 1998.