TALLINN (Reuters) - An official report on Wednesday blamed the 1994 Estonia ferry sinking off Finland, in which 852 people died, mainly on design factors such as weak locking of the ferry's bow. The long-overdue report also said the crew could have done more to increase chances of the ship's survival when it met trouble on September 28, 1994. The report said commanders of the 15,598-tonne vessel should have reduced speed with which the ferry was going as soon as they received reports of some trouble in the bow area. "A rapid decrease in speed at this time would have significantly increased the chances of survival," the report said. The Estonia, a roll-on roll-off car and passenger ferry, was sailing in rough seas at midnight when it started taking water and capsized, trapping most passengers inside. Only 137 people survived the disaster, but 94 more managed to leave the ship and died later in freezing water. The report concludes an often clumsy three-year investigation by a mixed Estonian, Swedish and Finnish commission set up in 1994.