Factual information AI gives you always needs to be checked, as you don't know if the source it's using is reliable. However, it can be quite good for summarising stuff. I use it at work sometimes if someone sends me a 100 page PDF that I just don't have time to read. I can upload that to AI and ask it to provide me a short bullet point summary of the key points contained within that PDF. The AI Assistant that's built into Zoom is also quite good as well. Add the AI bot to any Zoom meeting you have and when the meeting ends every attendee gets emailed the minutes of the meeting with a summary of points discussed etc.
In rail terms, it's also good for timetables as long as you include the website you want it to check. For example - "Can you use website x to summarise for me the frequency of trains between station x and station y, including what the difference is on Sundays". Basically, give it the source you want it to use, rather than let it go rogue and find its own sources.