Other Stationary Plant Operators
This unit group covers Stationary Plant Operators not elsewhere classified. It includes Boiler and Engine Operators, Bulk Materials Handling Plant Operators, Concrete Batching Plant Operators, Concrete Pump Operators, Railway Signal Operators and Weighbridge Operators.
Peak hour in the signal box
You are a railway signal operator in a regional control room, watching a board of lights and a radio for the next three hours. It is 4:30pm and the commuter trains are about to start. Two freight trains are also on the line, a track crew is working south of town, and a small fault has just shown up on the display.
Choose what you would do. Then see what happens. There are often good reasons for each choice.
We are finishing early and want to clear the track at Mill Cutting. We can be off it in ten minutes, not the thirty we booked. Can you let a train through on that stretch now? There is a freight waiting.
Wait until Cass confirms by radio that every worker and machine is clear, then release the train
Cass confirms with a roll call and the track is clear. The freight train is released a few minutes late. The only way to be sure of a clear line is to hear it from the person in charge.
Release the freight train now since ten minutes is close enough, and the crew will be out of the way by the time it arrives
The crew is still on the track when the train reaches the cutting. The driver sees them and brakes in time, but it is the closest call of the year. The investigation starts that evening.
Tell Cass to ring back when the crew is clear, and carry on with the commuter trains
It is safe, but Cass is not told which train is waiting, and the crew rushes because they think the line is blocked. You could have told him what the delay was costing.
The north signal is red on your board, but I can see it from here and it looks green to me. A commuter train is three minutes from the approach. I do not know which of us is right. What do you want to do?
Hold the commuter train at the previous signal and report the fault to the engineering team
The train is held safely, but you have not told the driver why, and passengers start to complain. A short announcement would have made the wait easier.
Trust the field report and let the train go, as the signal is probably only a display fault and the line looks clear
If the signal is red in the field, the train is entering a section that may not be clear. The driver reports a red signal and has to emergency brake. The report from the field was wrong.
Hold the train at the previous signal, tell the driver why and report the fault to engineering
Engineering finds a faulty relay. The train waits seven minutes, and the driver reassures the passengers. When two sources disagree, safety means trusting the safer one.
We have a delay building up on the line. Management wants you to be quicker, and they say the old operator used to run trains closer together to keep to time. Do you think you can do that tonight?
Say yes, run the trains closer together and make up the lost time
You run trains closer than the rules allow. A signal check by the safety team picks it up, and you are taken off the board for a review. Keeping to time is not worth breaking the rules.
Explain which rules you must keep and suggest what can be done within them to recover time
Lucia hears you out and agrees to move a freight path. A small change recovers some time without cutting a single safety margin.
Say you will do your best, but make no promises
Your answer is honest, but Lucia is left unsure what you will actually do. A clear explanation would have given her something to plan around.
How it went
The commuter trains ran safely, a fault was found and the track crew was clear before the freight went through. Stationary plant operators, whether they work signals, weighbridges or batching plants, protect others by being exact. Does that kind of careful, quiet responsibility sound like you?
This is a simplified, fictional situation to help you explore. It is not professional instruction or a test of your ability.
Case study: The truck that was a little too heavy
A fictional case set in a rail signalling centre, with a weighbridge at a quarry gate and a concrete plant in the same fictional district.
The situation
Pita worked the weighbridge at the gate of Black Ridge Quarry. A tipper truck pulled on, its driver, Ben, someone Pita had known for years. The ticket showed the load was over the legal limit on one axle. Ben said he was already late, the customer was waiting, and that he would put his hand up and take the fine. A queue of trucks was building behind him, and the ticket could be printed in seconds.
What they did
Pita told Ben, politely and clearly, that she could not issue the ticket for a load that exceeded the limit. She explained that the weight was recorded as soon as the truck stepped onto the scale, so there was nothing to quietly fix. She offered him a chance to drop some material in the stockpile and re-weigh, and radioed the loading team to suggest a lower bucket count.
How it turned out
Ben took the load down, was weighed again and left twenty minutes later. He was short with her at the time, but told her the following week that he had been stopped on the road by an inspector, and that the ticket had saved him a fine. The quarry changed how it loaded the trucks.
What would you do?
- How would you say no to someone you like and see every week?
- Why does it matter that the weighbridge record is always accurate?
- What would you do when a queue behind the truck is growing?