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Physical Acoustics Corp. (PAC) offers an acoustic emission (AE) testing system designed for structural integrity tests of railroad tank cars. Emphasis is placed on the integrity of stub or non-continuous draft sills and sill-to-tank attachment welds. Under the AE technique, the test is performed without removing any insulating jackets, trucks, couplers or draft gears; the test does not require stripping of paint from welded surfaces. It detects sub-surface as well as surface defects, and does not require “shopping” of rail car to perform test. It can be performed at plant or field locations and is accepted by FRA and AAR.