There are only a few days a year when you can actually catch a train at Burlington's Union Station, and two of them are coming up in May. The Champlain Valley Flyer makes four round trips to Shelburne on Kids Day, May 10, which also happens to be National Train Day. You can hop aboard after the annual Kids Day parade, which starts at 9:40 a.m. On Sunday, May 11, the Flyer heads to Middlebury for Mother's Day. You'll have time to treat Mom to a late lunch downtown before riding back in the 1940s-era coach. "Some kids get pretty excited about it," says ticket agent Brian McGregor. Some adults do, too. Heads up, dads — the train runs to Middlebury on Father's Day, too.