The Metropolitan Transportation Authority board is scheduled to vote Wednesday on a $334.9 million contract for Siemens to build 27 dual-mode locomotives for the Metro-North Railroad. A document in the board package for Wednesday’s meeting says the purchase, an order for 19 locomotives with the exercise of an initial option for eight more, is funded by a Federal Transit Administration grant and includes options for up to 144 additional locomotives for Metro-North, the Long Island Rail Road, Connecticut Department of Transportation and the New York State Department of Transportation. The order is intended to replace 31 GE P32AC-DM locomotives nearing or exceeding their projected 25-year lifespan. The website The Long Island Rail Road Today reports the locomotives will be based on the existing Siemens Charger design.