The network played a significant role in the period of transition to democracy following the death of Franco and in the years leading up to and immediately following the adoption of the Spanish Constitution of 1978 , notably in its coverage of the attempted coup of 23 February 1981 . Cadena SER also played a vital journalistic role with its reporting of the events and circumstances of the 2004 Madrid train bombings
2004 Madrid train bombings
2004 Madrid train bombings
Cadena SER