EditorialA train chassis is polished with the help of a computer-controlled robotic arm at M?rklin's facility in G?ppingen, Germany, on Feb. 11, 2021. (Felix Schmitt/The New York Times)
EditorialA train chassis is polished with the help of a computer-controlled robotic arm at M?rklin's facility in G?ppingen, Germany, on Feb. 11, 2021. (Felix Schmitt/The New York Times)