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Rex Features
The actor pulled out of the project earlier this month, reportedly because he refused to lower his $20 million pay to help reduce the movie's budget.
According to Variety, the Oscar winner took a new script with him while promoting The Taking Of Pelham 1 2 3 in Europe and has reached a compromise with Fox.
Washington will reteam with Man On Fire director Tony Scott on the film.
Mark Bomback's Unstoppable script centres on an engineer who teams up with a young conductor (Chris Pine) to stop a runaway train filled with deadly chemicals.
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