SKYWALKER, METAL - TRAIN MECHANICS SCRAPING

These're Skywalker Sound sound effects.

Movies

 * 102 Dalmatians (2000)
 * A River Runs Through It (1992) (includes an elongated version)
 * Hoodwinked! (2005) (Heard in various pitches, including the elongated version from "A River Runs Through It")
 * Indiana Jones and the Last Crusade (1989)
 * Saving Private Ryan (1998)
 * Star Wars: Episode II - Attack of the Clones (2002)
 * Star Wars: Episode III - Revenge of the Sith (2005)
 * Star Wars: Episode V - The Empire Strikes Back (1980) (debut)

TV Series

 * Star Wars: The Clone Wars (Heard in "Weapons Factory")

Video Games

 * Star Wars: The Clone Wars (2002) (Video Game)

Audio Samples
Shots of a train in "102 Dalmatians" and some mechanics in EPISODE V, plus relative sounds in "Hoodwinked!" and "A River Runs Through It" are good for reference. They sound like high-pitched metal scraping/clanking sounds and often accent the mechanics of droid factories on Geonosis in Star Wars.