DBRs 1199 and 1200 were the initial pair, becoming known as the "Bobsy Twins" (sp), likely a reference to the Bobbsey Twins due mainly to their consecutive numbers (a rarity under the TMS numbering system).
Minnesota Twins | Twins | Cocteau Twins | Twins (1988 film) | Thompson Twins | The Gutter Twins | The Edison Twins | Kray twins | Twins (group) | Twins (TV series) | Twins of Evil | Kessler Twins | Dynamic Twins | Twins (Ornette) | twins (1988 film) | The Z Twins | The Venetian Twins | Stieber Twins | Ragga Twins | Conjoined twins | Bobbsey Twins | Winston-Salem Polar Twins | Twins Seven Seven | TWINS mission | Twins Mission | The Z Twins (disambiguation) | The Watson Twins | The Venetian Twins (musical comedy) | ''The Venetian Twins'' | The Sunlandic Twins |
The Make Believe Stories series, begun in 1918 under the pseudonym of Laura Lee Hope (best known for the Bobbsey Twins series), consisted of 12 books.