These are sound effects that were made by Skywalker Sound for usage on the Alien Tripods in War of the Worlds (2005). It was created using the sound of a didgeridoo blowing and an african drum to punctuate each note. They were created by Randy Thom.
The Polar Express (2004) (A slightly extended and lower-pitched variant of the the 1st half of this sound or a very similar sound is used once with a reverb effect added as an ambient sound for the locomotive as it sits idling outside of the Hero Boy's house before he walks up to look at it.)
Popstar: Never Stop Never Stopping (2016)
Rango (2011) (Only the 1st half is heard once when the giant monster eye opens up as Rango and the townsfolk walk through the tunnels under Dirt.)
Scary Movie 4 (2006) (A heavily edited/processed version of this sound is used.)