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19 Cards in this Set

  • Front
  • Back

How is the throttle modulated?

Throttle should only be moved one notch at a time & only moved once load amperage has stabilized.

It is preferable to maintain speed in one throttle setting, keeping throttle variations to a minimum.

How is the train controlled on descending terrain?

Through the use of dynamic braking or stretch braking.

How is the train controlled through undulating Terrain?

If the prevailing grade through the undulation is level or ascending?

Train must be controlled by throttle modulation only.

- reducing speed at the crest.

- increasing the setting when

approaching the increase in


Best results are obtained by maintaining transition with a minimum throttle adjustments.

When a long freight train that is heavily loaded towards the rear passes through undulating terrain (level/ascending);

What issue will the driver encounter?

What action can the driver take to reduce this effect?

The train will have a tendency to stretch out as the last vehicle commences ascent;

- leading to severe coupling forces.

This force can be weakened if the throttle is reduced just prior to rear vehicle beginning to ascend.

When train is required to ascend a steep gradient;

What must the driver ensure?

1) The throttle is in notch 8.

2) The required transition is achieved.

3) Load amperage has stabilised.

4) The train brakes are fully released.

What are the advantages of good train handling and use of momentum?

1) MInimise adverse train forces.

2) Faster running times.

3) Better fuel consumption.

4) cost savings through less wear on braking components, wheels & fuel.

WHat are the (2) major methods by which the driver can use momentum to reduce train braking?

If braking is required on descent where is it preferable to make a brake application?

1) Using small inclines to reduce train speeds.

2) Making the necessary brake applications as early as possible.

- if it is known that braking is

required on descent - it is

preferable that this is made near

the top where speed is low.

How can the driver use momentum to reduce fuel consumption?

Driver can use momentum to operate in a lower throttle setting to reach destination with reduced fuel consumption.

What are the advantages of the dynamic brake?

1) Reduces wear on brake equipment & wheels.

2) reduces the time locomotives are out of service.

3) Faster running times on downgrade sections.

How does using the dynamic brake reduce fuel consumption?

The air compressor is not needed to produce large volumes of air needed to control the train on downward gradients.

As the compressor is driven by the diesel engine, this represents a fuel saving.

where does the dynamic brake apply the brakes on the train?

What consequences does this have and how does the driver combat this?

At the head end on the loco, which can result in excessive buff force if applied to rapidly.

1) Sufficient time for throttle to placed in idle before dynamic brake is selected.

2) After selecting the dynamic brake, Driver must allow 10 seconds before brake is available.

NOTE: This also allows tension to reduce (train to bunch) and prevent severe coupling slack action.

when can the dynamic brake be applied/released?

Dynamic brake must not be applied or released while the automatic brake is applied.

When is the dynamic brake magnet valve energised?

what consequences does this have?

When the dynamic brake is moved out of the SET-UP position to increase braking.

This means that the automatic brake is fully operable in the SET-UP position.

If the Automatic brake are already applied and dynamic brake handle is moved out of the SET-UP position;

will the locomotive brakes apply?


How is the dynamic brake released?

1) Dynamic brake must be gradually reduced to the SET-UP position (10 seconds).

- this is to allow coupling slack to ease.

2) Dynamic brake then released and throttle used to apply power.


if reducing speed:

2) Dynamic brake must be released before using the automatic to bring train to a stand.

- as dyno. is not effective below 25km/h

- unless loco has extended range dyno.

When using the dynamic brake and the Brake warning light remains illuminated for more than (3) seconds, what must the driver do?

What does this indicate?

Driver must immediately reduce braking effort until the light goes out.

If the warning light illuminates for more than (3) seconds:

- This indicates that the automatic correction

of the dynamic brake has not occurred and

the system is overloaded.

Is the dynamic brake train-lined?


when will a dynamic brake equipped locomotive not function in a multi-unit consist when fully connected with the multi-unit cable?

When placed behind a non-dynamic brake equipped locomotive.

When should a locomotive not be turned ON-LINE (Run position - Isolation switch)?

when the dynamic brake is being used.