Then the Associated Press picked up the story, and a week later the photograph, in rotogravure, could be seen in the Sunday edition of the most important newspapers in all the large cities in the country.
An intaglio printing process in which letters and pictures are transferred from an etched copper cylinder to a web of paper, plastic, or similar material in a rotary press. The Free Dictionary
It had been decided that Mr Popper should ride in the baggage car with the penguins to keep them from getting nervous, while Mrs Popper and the children should ride in one of the Pullmans.
The Poppers here are traveling by train and it is clear that the meaning here is a railway carriage, and I presumed it was a manufacturer, but wanted to check it out as it wasn't a term familiar to me. Of course it's all there on wiki, George Pullman started making railway carriages with sleeping berths after spending the night sleeping in his seat going from Buffalo to Westfield, New York. Ha. I sat up from Baltimore to LA in the 80s because I couldn't afford to buy a sleeper. Buffalo to Westfield seems more a commute now.