Unfortunately, there are no specific times that the trains run. The best place for information is the PanAm Railways Yahoo! Group, where You have Bill Sample in Berlin who always reports what he sees, and me in Holyoke. EDPL is also just as likely to run on Sunday as any other day, like it did yesterday, and PLED is probably going to come north tomorrow or this afternoon. The turnaround time for EDPL/PLED has substantially decreased over the last two years or so since PanAm reinstituted PL-1. Now PL-1 (this week it's MEC 379) does the switching work in Connecticut, with the exception of the CNE interchange in Hartford, and EDPL/PLED simply shuttles cars back and forth.
As for me, if you look on Bing! Maps my condo complex is the one just south of the US Route 202 Bridge, and I have a direct view of the tracks from my condo. The estimated travel time of an EDPL for example, is roughly two hours from where I'm at in Holyoke, to Berlin station where Bill's at. There are a number of factors involved that can increase/decrease that time: track rehab from Springfield to East Northfield will be done this year, which should cut at least 1/2 hour off of the travel time, if the train switches the CNE interchange in Hartford, and/or has to wait for an Amtrak train that increases the time. Haven't seen any containers for months, so I couldn't say for sure what the deal with that is. Also, what town do you live in, and how close to the tracks or railroad yard in Plainville? My advice is try to catch PL-1 doing some switching work, which could be interesting, because they usually swap power weekly. This weeks PL-1 is MEC 379, last weeks was MEC 306, and the week before MEC 380. They've also had B&M 335, MEC 354, and a number of others.
Hope I helped!
Peace,
Jonathan