Permanent Way Inspector
A Permanent Way Inspector (PWI) was a Railway Employee who had the responsibility for the condition of the railway track and associated embankments etc in his area of jurisdiction. (i.e the "Permanent Way"). He would make physical inspections of the track - sometimes on a push trolley. Maintenance staff would work in conjunction with the PWI to ensure the tracks were kept in good order and the safety of the railway was maintained.
The PWI was part of the "Traffic" department of the railway - as opposed to the "Loco" department. (Also referred to as the "Way" and the "Works")