In-house lawyers at Trinity Industries Inc. worked closely with Trinity’s outside counsel to overturn a more than $663 million False Claims Act judgment against the Dallas-based company after it was accused of defrauding the government over its highway guardrail system.

Trinity is a diversified industrial company that owns businesses providing products and services to the energy, chemical, agriculture, transportation and construction sectors. Sarah Teachout, a Trinity vice president and the deputy general counsel, said the company has about a dozen lawyers in its legal department.