I watched this movie in maybe 1992 but it's not the iron giant for sure. I just remember a young boy finding the old war robot and some bad guys trying to take it. I seem to remember the robot was an old war relic and a chase scene with a steam train springs to mind. Thanks in advance for anyone who helps solve this.
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In Castle in the Sky (1986) there is an ancient, broken robot that is later reanimated and begins attacking people.
The young boy (Pazu) doesn't find the robot, but he and a young girl (Sheeta) are taken to a fortress where the robot is already being studied. The "bad guys" were attempting to repair it.
There is a scene later in the movie where Pazu and Sheeta find another robot that is deactivated and overgrown with grass and moss. This may be where you got the "buried in a cliff" memory.
The movie also includes a steam train chase between the young boy and girl, a band of pirates, and a group of government and military men.
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Astro Boy (2009 movie) also has a derelict robot (Zog) revived, but no steam trains that I could remember. – Eike Pierstorff Aug 6 '18 at 15:36
