Young patients at Children's Hospital Boston are treated to the sight of a working toy “train” delivering their meals each day. The vehicles, called TUGS, are actually standard mobile, self-guided robots like the ones used by hospitals all across the country to deliver meals, supplies and laundry. But at CHB, six of the units have been outfitted by supplier Aethon with colorful facades to make them look like toy trains — to the delight of sick children. The idea of fashioning the robots to ...

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