Sixteen people were injured in the June 2015 crash, including two teenage girls who needed leg amputations.
In April, Merlin Attractions Operations Ltd admitted breaching the Health and Safety Act.
The theme park originally said the accident was caused by "human error." But prosecutors argued the fault was with the employer not individuals.
Sentencing, Judge Michael Chambers QC described the crash on the £18m attraction as a "catastrophic failure" and said human error was not the cause as was suggested at first.
