Note how visible the train is, even at night. Because it's a populated area, they don't go through there terribly quickly. Even without horns, they make a fair bit of noise-- kids hold their ears as the trains go by. There are crossing gates at the cross streets, and they're also noisy.
I still contend that if you're going to get yourself killed in this situation, the presence or absence of a horn probably won't make much difference.