Our special guests are the members of the 4-H Inventors club. They will showcase their prize-winning Rube Goldberg machine plus a giant harmonograph (similar to a spirograph), with pendulums on all three axes, and other projects they made this year. You can also enjoy real train spotting, a model layout, a toy train play set, photos and memorabilia of the railroad’s glory days and historic Silver Spring, and more! Free.