This sound effect can be found on BBC Complete Sound Effects Library, which was made by Pro Sound Effects. It's commonly referred to as "Paxton's horn" in Thomas & Friends.
Clean, Full Length and Unedited Link to the Sound Effect
Used in
TV Shows
- Thomas & Friends (second note used as Paxton's horn in a normal pitch, Sidney's horn in a higher pitch, modified for Fernando's horn in a low pitch, and modified version is used for Daisy's horn in a high pitch.)