Why can AI seemingly answer so many complex questions but even a train schedule trips it up for me?

I can't tell if I'm doing something wrong but I'm hoping to catch a train car from my grandpa's era, there is a website that will confirm based on train number (like a flight number) and date. That's all you need! Super simple! I gave GPT the date I can travel, and the website traincar, and it checked the internet archive thinking it find future trips! It even checked the train company website and MISERABLY failed! I found the trip with a few mins of clicking around on the site, but isn't this something AI should be great at? Both claude and GPT said well if you use the website and find the tr