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Over the past several years, mass transit systems in the United States have been facing increasing demands on their power systems. This is due to the several factors: increased ridership, growing overall demand for power and limited expansion of power generation facilities due to environmental concerns. Finding the solutions for these problematic factors has increased the demand for additional power sources at minimal cost, an ability to recycle the regenerative braking energy created by braking trains and line voltage stabilization. These demands have been successfully addressed in a project that tested a directly connected high capacity nickel-metal hydride (Ni-MH) battery developed by Kawasaki. These controlled tests were conducted at the New York City Transit (NYCT) early in 2010. This paper presents the results of the tests on the Battery Power System (BPS) using our GIGACELL batteries at the Far Rockaway and Manhattan locations in the NYCT system.