The TWU, for its part, later claimed that it was forced to strike in order to prevent the MTA from raising the retirement age, rather than striking to reduce the retirement age. That was not the case, however, because it is state legislation that sets the terms of the pension plan, and under state law pension terms may not even be the subject of collective bargaining. Years after the strike, the pension plan remains retirement at age 55 after 25 years worked. And as a result of past underfunding, due to optimistic rate of return assumptions, and other pension enhancements that benefitted the TWU, such a retroactive inflation adjustment for retirees and an end to employee contributions, the cost of the pension plan to New York City Transit soared from $468 million in FY 2005 to $770 million in FY 2010 with a projected $950 million in pension costs forecast for FY 2014.