Today he's combined videos of model train with German Shepherd puppies. Animal videos seem to gain traction on YouTube. We love seeing pets and their owners interact. We could be talking about dogs or cats or adult or puppies and it seems there's an audience for it.
For Zimmerlin, his vids on his cruises and his model trains got the traction for his channel. However, time will tell if this video combing puppies and a model train will itself go viral.