BUZZ-Ballard Power Systems Inc: To develop modules to power trams in China
** Canadian fuel-cell products maker's U.S.-listed shares up more than 7 pct at $2.44 premarket
** Ballard signs deal with Chinese locomotives maker Tangshan Railway Vehicle Company to develop a new fuel cell module to power trams
** Up to Tuesday's close, stock had fallen nearly 36 pct in the last 12 months
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