Credits show "Music used in this documentary series sound archive". That's referred to the films made by RENFE in 1948 to celebrate
the Spanish railways centenary. In other documentaries from the same series there is not such credit.
Musical themes from: "Pomp and circumstance" #1 to #4, by Edward Elgar "Symphony in Blue", by George Gershwin-Kostelanetz "Organ Melodies", by Sidney Torch "The planets", by Gustav Holst (as Gustav Theodore Holst) "L'Oiseau de feu" ("The Firebird"), by Igor Stravinsky (as Igor Stravinski )