Small railroad building visible from Spuyten Duyvil train station

I can’t claim to know anything about this little building. It is plainly visible from both the Henry Hudson Bridge and the Spuyten Duyvil train station, so I would guess tens of thousands of people are exposed to it daily. However, a quick search on the web didn’t turn anything up (I didn’t know what terms to use, though). I would love to see it close up, but I am not one to jump fences and risk life and limb on the train tracks (not to mention prison for trespassing) for this.

Do you know anything about it, dear reader?

I love finding this kind of anachronistic building sitting in plain view (or the Bronx, har har). There is a short Wikipedia article on the church with the normal balance of trivia and fact.