Stadler was the only supplier in the final round of bidding, as Alstom did not submit a final offer and a bid from China was rejected because of quality concerns.
Alstom says its current product range is not suited to the requirements for narrow-gauge trains, while the small size of the order would have made customisation impracticable.
Stadler expects to complete a prototype by 2020 and four more trains will be manufactured by 2022.
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