Mark Mallman gets aboard the Choo Choo Bob express, courtesy of Northern Outpost

Toy trains have a venerable history in children’s TV programming, from the train serving Mr. Rogers’s Land of Make-Believe to the anthropomorphic engines seen on Thomas the Tank Engine. Choo Choo Bob’s, the beloved toy train store on Marshall Avenue’s “Treat Street,” now produces its own kids’ show, and the whiz kids at Northern Outpost recently turned Mark Mallman’s train-centric song “Get Snappy” into a music video starring several bright-eyed youngsters dancing around Choo Choo Bob’s domain.