Baseball arrived in
Aguascalientes in hand with the
railroad at the beginning of the 20th century. A group of Mexican and American railroad workers on the
Mexican Central Railway held a baseball game in March 1902. The teams, the Aguascalientes Mexicans and American Railways, played the first game in the state on the railroad's land. The Rieleros were founded in 1975 by Raúl Medina Reyes in partnership with Don Pedro Barbosa, José Ortiz Benavides and other local entrepreneurs, who bought the
Veracruz franchise and moved it to Aguascalientes. Funds were raised through the issue of shares. A survey was then conducted to select a team name. The name Rieleros was chosen to honor the area's railroad heritage. The team debuted in the Mexican League on 14 March 1975 losing 1–5 against the
Charros de Jalisco in the
Parque Alberto Romo Chávez. In
1978, the Rieleros won the Mexican League championship, managed by Jaime Favela in his first season as manager. With players such as
Horacio Piña,
Cecilio Acosta,
Ángel Moreno,
Willie Crawford,
Clarence Jones and
Chico Rodríguez, the Rieleros finished as leaders of the Southwest division with a 89–62 record. In the quarterfinals, the Rieleros defeated the
Diablos Rojos del México 4–2, including a perfect game by Piña. In the semifinals, Aguascalientes defeated the
Cafeteros de Córdoba in six games, 4–2. In the championship game, the Rieleros defeated the
Algodoneros de Unión Laguna 4–1 to claim their first (and as of 2024, only) Mexican League championship. In December 1999, the Rieleros franchise was bought by a group of businessmen from
Puebla and renamed to
Pericos de Puebla, who started to play in the 2000 season. In December 2003, ahead of the 2004 Mexican League season, the Cafeteros de Córdoba franchise was moved from
Córdoba, Veracruz to Aguascalientes, bringing baseball back after a hiatus of four years. In 2008, the Rieleros de Aguascalientes were transferred to
Nuevo Laredo,
Tamaulipas, and were renamed the
Tecolotes de Nuevo Laredo. They returned to Aguascalientes in 2012 after the
Dorados de Chihuahua franchise was relocated. ==Roster==