popular mechanics described s1 as the "pride of american railroad" in an article in their june 1939 issue..the new york world's fair of 1939 attracted nearly 25 million visitors, s1's first 50,000 service mile was accumulated from this fair's live steam show. after the world's fair, the s1 was re-lettered for the pennsylvania railroad fleet. as one of the most important exhibits of the world's fair, s1 was used by the prr for various publicity purposes; her image was featured in calendars, stamps, advertisements, brochures, puzzles, etc. the american bank note company issued a series of posters in 1939, published by the eaton paper company as part of an advertising campaign. one of the posters depicts the s1 hauling the broadway limited.