I'm my experience it's pretty good, obviously it's not perfect but each page has an 'last updated' link, i.e. here's the Philippines page:
Page last updated: 30 May 2015
with the note
After hurricane damage, these trains were temporarily suspended in late 2012 and are still believed to be suspended as at 2015. It's not clear when or if train service will be reinstated. Please see www.pnr.gov.ph or https://www.facebook.com/pnrailways?ref=bf
Update May 2015: It's reported that PNR hope to get the Bicol Express back up & running by Christmas 2015. Funding has been secured to extend the route all the way to the southern end of the island in due course.
That seems pretty much the case, trains are still suspended. I can't find a source for the Christmas 2015 date but it sounds like the sort of thing PNR would say (not that it will happen).
Given that the Philippines has so little train service I'm impressed he even bothers with a page, let alone keeping it up-to-date.
As Blackbird57 say in the comments, many updates rely on people e-mailing in corrections and updates, so it's a bit like a 'curated' wikipedia. I.e. I'm sure that Philippines update came from a local here, possibly from a non-English news article which is why I can't find it in search.
But a lot of the core schedules and disruptions (particularly Europe) are updated directly from the main schedules published everything six months or so.
Of course, if there's something you want to double check then
Is there still work on the train line in X as of June 2015, if so when will it stop?
would seem completely on topic for this site ...