(A)inspect and test a signal system used by a railroad carrier; and
(B)decide whether the system is in safe operating condition.
(2)In carrying out this subsection, the Secretary may employ only an individual who—
(A)has no interest in a patented article required to be used on or with a signal system; and
(B)has no financial interest in a railroad carrier or in a concern dealing in railroad supplies.
(b)The Secretary may investigate, test, and report on the use of and need for a signal system, without cost to the United States Government, when the system is submitted in completed shape for investigation and testing.