For some reason the question was put on hold. I can even understand that at a first glance the question might considered too broad. But I got some really good answers telling about the update rate of the website and explaining how the update process works including the time-stamp information.
When this happens why do people insist in considering the questions too broad?
In general, in this situations some time should be given to a question. I think the answers will prove (or not) if a question is too broad or not.
I voted to reopen. For starters the question isn't broad. It might be opinion-based since the answers would rely on anecdotes by people who actually used the website and found it reliable/not reliable. However we received an answer by the man himself, explaining how he goes about to keep up the reliability by updating the site on a constant basis.
What can be done to improve the on-topicness of the question it to reword it to something like: How up to date is the Man in Seat61?, to better fit the accepted answer.
After 2 reopen votes, I cast another reopen vote and the question is now reopened. As @JoErNanO already mentioned, the question is not too broad. It is quite specific and definitively also not off-topic. Concerning the opinion-based problem. The question might elicit a lot of opinions or anecdotal evidences, but it would (at least theoretically) also be possible to evaluate the reliability objectively.