SKYWALKER, TRAIN - FAST HEAVY CHUGGING

This is possibly a Skywalker Sound sound effect.

Used In

Back to the Future Part III (1990) (Debut; used as the chugging sound that emits from Central Pacific No. 131 before Doc and Marty climb onboard the caboose at the end of it's train.)
The Iron Giant (1999) (Used as the chugging sound for the steam locomotive in a low volume just before it hits the Iron Giant.)
The Polar Express (2004) (Used as the chugging sound of the locomotive when Smokey and Steamer are fixing the headlight. It can also be heard in the "It Takes Two" deleted scene.)
Thomas and the Magic Railroad (2000) (An edited sped up variant is used a few times for the chugging sound that emits from Lady.)
Toy Story 3 (2010) (Low volume; used as the chugging sound that emits from Prairie Pioneer No. 95 in the opening scene, before Woody jumps inside the cab to stop it from plunging off the bridge that One Eyed Bart blew up.)