devilsho

I live in a dense city area, and in the evening I hear a lot of train horns. In the daytime, however, the trains that run along the interstate never seem to blow their horns. Why do some trains do this and some don't?

I always figured that the trains had to blow a horn as they went through a certain part of town, but I've never seen one actually do it.

Do they have to at night but not in the daytime? Or is it only trains that go along a certain railroad? None of the above?

I have POTS as well, and can't smoke pot because of it. Especially when it's hot outside, smoking makes me faint or just really sick. It's very unfortunate