DALLAS — Houston’s transportation authority, Metro, faces delays and growing costs on a $1.5 billion light-rail expansion after its purchase of 103 rail cars from a Spanish manufacturer was found to violate federal law.

Metro “violated both federal procurement law and the Buy America requirements” during the procurement and award of two light-rail vehicle contracts to the Spanish rail car maker Construcciones y Auxiliar de Ferrocarriles, according to Federal Transit Administration head Peter Rogoff.

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