How do I find out a train schedule?

I don't know if this is the right place to ask this question, but here goes. I am trying to find out the train schedule for the CSX-Old Main Line trains that run thru Patapsco State Park, especially on weekends. I am starting to ride my horse thru the park and he was terrified by a train whistle close (about a few hundred yards) to us last weekend. I would love to know when the train crosses Marriottsville Road and Old Court/Woodstock Rd, so I can avoid being in the area then. Is there anyway to find this out?

In the meantime, I am buying train cd's to play to desensityse him to the noise.

Thanks for any help.