The correct answer is C. PWI.
A PWI, or Permanent Way Inspector, is a railway employee who is responsible for inspecting and maintaining the track and associated infrastructure. They are also responsible for ensuring that the track is safe for trains to operate on.
The PWI is the most senior railway employee who is responsible for the safety of the track. They are responsible for signing off on the competency certificates of gatemen, who are responsible for opening and closing railway gates.
The other options are incorrect.
- CI, or Chief Inspector, is a railway employee who is responsible for overseeing the work of the PWI and other railway employees.
- LI, or Line Inspector, is a railway employee who is responsible for inspecting and maintaining the track and associated infrastructure. They are not responsible for signing off on the competency certificates of gatemen.
- TI, or Track Inspector, is a railway employee who is responsible for inspecting and maintaining the track and associated infrastructure. They are not responsible for signing off on the competency certificates of gatemen.