Tom Williams, Malta, NY A: Though model trains for the 19th century aren't as common as items for the steam-to-diesel transition era, they're out there, but you may need to do some hunting.

Model trains have long captivated the imagination of hobbyists, collectors, and enthusiasts of all ages. From their origins as simple tinplate toys to today's intricate, highly-detailed machinery ...

Researchers from NVIDIA and Carnegie Melton published a paper, and footage, highlighting their new model which trains robots to move like famous athletes.