Trainspotting

Last night was fun taking pictures of the trainstation, so I thought tonight I'd go to an active one and snap a few long exposures. Once the security guard realized what I was doing, though, she threatened to kick me out. I told her it was for a "school project" so she let me stay a little while. So evil..

Anyway, I have a question for all you expert photographers out there. It seems whenever I take a night shot I get -awful- flares and spots in the picture. Is there any way to get rid of these? (The blue one in this picture is nothing compared to the others.) Also, I know long exposures with a digital camera means noise, but are there any ways to atleast reduce it, like different camera settings?

So... yeah.