The construction - based company diversified during the 1950s, moving into coal production and, later, oil and gas, and
railroad equipment manufacturing and servicing.
These positions require (1) broad knowledge of
railroad operating practices and recordkeeping; (2) practical knowledge of methods used in the installation, maintenance, or
manufacture of
railroad equipment, signal systems, or track; (3) knowledge of safety practices applicable to the
railroad industry and related laws, regulations, and standards; and (4) knowledge of the investigative techniques used in determining the cause of accidents.