Together with this information shared with me by Chava:
So that's why there was no train service for a very long time, all the way from the Central bus station in Jerusalem to French Hill and Shuafat, on December 31st, and then again earlier this week. The train company claimed it was because of electrical problems, but it sure was strange that they would be unable to fix those problems for so long, or that the electrical problem should recur, it didn't make sense. I guess "they" didn't want the public to find out about all these armed Hamas men in Jerusalem, specially after they made such a fuss over toy guns at a Jewish wedding, and about a masked Shabak agent provocateur brandishing a knife through a piece of paper -Oh no, how abominable, how dangerous, how "terroristic"! On the other hand, real live fire from hundreds of real live terrorists is a non-event, I suppose.