PTS On-Track Plant and Machinery Safety — Questions and Answers
Question 1: What is 'On-Track Plant' (OTP) in the context of railway safety?
- Vegetation growing along the railway embankment
- Machines and vehicles that travel on railway rails and are used for track maintenance (Correct answer)
- Electrical infrastructure mounted on overhead gantries
- Fixed signalling equipment installed in the track
Correct answer: Machines and vehicles that travel on railway rails and are used for track maintenance
On-Track Plant (OTP) refers to self-propelled or towed machines that run on the railway lines and are used for maintenance tasks — examples include tamping machines, ballast regulators, stoneblowers, and road-rail vehicles (RRVs). They present unique hazards because they occupy the track and move within worksites.
Question 2: A road-rail vehicle (RRV) operating within a safe system of work is dangerous to track workers because:
- RRVs always travel faster than conventional trains
- Workers can be struck or crushed by the plant within the worksite, even in a possession or blocked line (Correct answer)
- RRVs only travel at night so visibility is always poor
- RRVs are exempt from the Safe System of Work requirements
Correct answer: Workers can be struck or crushed by the plant within the worksite, even in a possession or blocked line
Even in a possession where line trains are excluded, an RRV or other OTP machine can strike, crush, or run over a worker within the worksite. Workers must stay out of the machine's working envelope (the area it can reach or swing into) and must not assume the OTP operator can see them at all times.
Question 3: Before any On-Track Plant begins moving on or near where people are working, the OTP operator should:
- Move immediately without warning to avoid disrupting the work schedule
- Sound an audible warning and ensure all workers are clear of the plant's movement area (Correct answer)
- Rely on the COSS to physically move all workers out of the way
- Only move when at least five workers are present as spotters
Correct answer: Sound an audible warning and ensure all workers are clear of the plant's movement area
OTP operators must sound an audible warning before any movement and confirm that all workers are clear of the intended direction of travel and the machine's working envelope. The COSS also has a responsibility to ensure the worksite is managed so that plant movements are coordinated with worker positions.
Question 4: What is the 'working envelope' of a piece of On-Track Plant?
- The paperwork required before the plant can be operated
- The full three-dimensional area that the machine's moving parts can reach during operation (Correct answer)
- The distance the machine can travel in one shift
- The maximum speed at which the plant can be driven
Correct answer: The full three-dimensional area that the machine's moving parts can reach during operation
The working envelope is the complete three-dimensional space that any part of the machine — including arms, booms, discharge chutes, or rotating components — can occupy during normal operation. Workers must remain outside this envelope at all times when the machine is in use or could move.
Question 5: When a road-rail vehicle needs to travel along the line through a section of track where workers are present, who is responsible for ensuring the workers are positioned safely?
- The OTP operator alone, as they control the machine
- The COSS, who must coordinate with the OTP operator and ensure all workers are in a safe position before authorising movement (Correct answer)
- Each individual worker, who must independently decide whether to move
- The signaller, who controls all plant movements via signal
Correct answer: The COSS, who must coordinate with the OTP operator and ensure all workers are in a safe position before authorising movement
The COSS is responsible for the safety of workers within the safe system of work, including coordinating with OTP operators. Before plant moves through or within the worksite, the COSS must ensure workers are at a position of safety and give clearance. The OTP operator and COSS must communicate clearly before any such movement.
Question 6: Which of the following is a specific hazard presented by tamping machines or ballast regulators that does NOT apply to conventional passing trains?
- They travel at speeds above 100 mph
- They discharge ballast, raise track, or eject material laterally during operation, which can injure nearby workers (Correct answer)
- They are always electrified at 25kV
- They cannot be stopped once they begin moving
Correct answer: They discharge ballast, raise track, or eject material laterally during operation, which can injure nearby workers
Tamping machines lift and vibrate track, while ballast regulators and stoneblowers discharge or jet stone laterally at high velocity. These processes can project material considerable distances, posing crush, impact, and entanglement risks to workers nearby — hazards that are entirely absent when a conventional train simply passes.
PTS On-Track Plant and Machinery Safety
What is 'On-Track Plant' (OTP) in the context of railway safety?