How many vehicles are in a class 455 formation?
4 cars per unit
Whst is the maximum speed of a class 455 train?
Maximum speed 75mph.
What is the length of a class 455 coach?
Length of a 455 coach is 20 meters.
How many traction motors does a class 455 has per Motor Coach?
A class 455 has X4 250HP traction motors per Motor Coach.
What is the maximum formation of only class 455 units that can be coupled together?
Maximum total formation of only class 455 units is a total of X8 coaches in the formation.
What type of coupler does a class 455 unit have?
External identification
A class 455 has a tight lock coupler
What is the maximum formation made up of class 455 + 456 traction units?
Maximum length formation of class 455 + 456 traction units is 10 coaches.
What other traction units may a class 455 fully couple to?
A class 455 traction unit may fully couple to other class 455 units and class 456 units.
What addition equipment is needed to mechanically couple to a 444/450 traction unit?
What is the maximum speed after coupling and why?
You will require an Emergency Coupling Adapter. Maximum speed allowed after coupling is 5mph, due to only being mechanically coupled and not additionally electrically coupled.
What does these terms mean in regards to the individual coaches
- DT A
- MC
- NDT
- DT B
Coach identifying names
- Driving Trailer A
- Motor Coach
- Non Driving Trailer
- Driving trailer B
What is the name of these 2 items on the class 455 traction unit?
455 external identification
- 1 = 42 way control jumper (oragne). Provides electrical power.
- 2 = Main reservoir pipe & main reservoir isolation cock (yellow)
External identification Class 455
What is the name of item 1 on this class 455 traction unit?
What position is A & B?
External identification Class 455
- 1 = Drumswitch
- A = Coupled
- B = Uncoupled
External Identification Class 455
What is the name of this item?
What 3 outputs does it produce?
External identification Class 455
The motor alternator runs continuously when the unit is cut in and produces 3 outputs used as follows:
- 415 volts A.C. Heating fans (including cab fans)
- 240 volts A.C. Lighting
- 110 volts A.C. Control circuits, Battery charging, Emergency lighting
As the 110 volt supply needs to be DC, it is passed through a rectifier which changes it from alternating current (A.C.) to direct current (D.C.)
Motor alternator failure Class 455
If the MA fails and the battery takes over, how many volts does it need to drop below before the unit cuts out?
Motor alternator failure Class 455
If the MA fails, the batteries will take over but will only supply 110 DC volts for the control circuits and emergency lighting. When the battery voltage drops below 80 volts the unit will automatically cut out.
If this happens, assistance will be required whereupon after coupling up all the pipes and jumpers, you will need to cut the defective unit in again using the aux set button on the good unit.
Motor alternator failed indication Class 455
What indications will you get if the motor alternator fails?
Motor alternator failed indication Class 455
- Only one marker / tail light
- No main lights
- No cab fans
- MA fault indicator illuminated (Red light)
MA fault indicator indications Class 455
Your motor alternator has developed a fault. what is the meaning of the following displayed by the MA fault indicator?
- Red light extinguished?
- Red light illuminated (steady light)?
- Red light illuminated flashing?
MA fault indicator indications Class 455
- Red light extinguished / MA working normally. (Healthy)
- Red light illuminated (steady light) / MA failed on the unit displaying the red light.
- Red light illuminated flashing / MA failed on the intermediate or and rear unit.
MA mcb locations Class 455
What cupboard is the MA mcb located & on what coach?
MA mcb locations Class 455
Drivers may be asked to check the status of the “MA” mcb located in the Control cupboard of the Motor Coach and reset if necessary as instructed.
Motor alternator failure Class 455
The MA is protected by an over Speed Relay and Fault Flag. Which coach & cupborad would you find it in. which 455 units is the fault flag not accessible in?
Motor alternator failure Class 455
The speed relay and fault flag is located in the control cupboard in the motor coach on 58XX units (Not accessible on 57XX & 59XX units). The MA will stop working should this relay trip. Phone a friend may ask you to reset the flag. This can be reset once using a non-conductive object such as a pencil, if this fault reoccurs you will need to seek further advice.
MA Fault Class 455
If your motor alternater fails in a single unit 455, what will you require?
MA Fault Class 455
If the train is a single unit this action will initiate an emergency brake application and no on train communications, assistance will be required.
Auxiliary Trip / Set Buttons Class 455
Where on a 455 unit would you find the Aux set/trip buttons?
Auxiliary Trip/Set Buttons Class 455
Auxiliary set/trip buttons are located in each driving cab and the Control Cupboard of the Motor Coach. Any of these buttons being pressed will result in all units in multiple being cut in or out as required.
Auxiliary Selector Switch Class 455
on which coach is this switch located, what is its function & what is its correct position?
Auxiliary Selector Switch Class 455
Located on the Motor Coach. For normal operation, the switch will be in the “Normal” position. The “shed supply” position allows the maintenance staff to test 750 volt DC equipment on the unit but are unable to get traction power.
Drivers are not required to operate this switch but must check that it is in the correct position (normal) when preparing trains for service.
Power Train Line Class 455
What equipment will become operative when the Auxiliary Contacters are closed?
Power Train Line Class 455
The following equipment will become operative when the Auxiliary Contactors are closed:
- Motor Alternator
- Compressors
- Low level coach heat
- Line light
MCB Tripping And Resetting Procedures Class 455
What are the 3 different tripped positions can you find a MCB in?
MCB Tripping And Resetting Procedures Class 455
The picture below shows mcbs in the three different positions (from left to right).
- Electrically tripped
- Manually tripped
- Normal position
Drivers are asked to include in their report the position of the mcb, prior to resetting when rectifying faults.
MCB Tripping And Resetting Procedure Class 455
How would you reset a electrically tripped MCB?
MCB Tripping And Resetting Procedure Class 455
If electrically tripped, reset by pushing up to the off position before attempting to place down in the on position.
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Wrong Direction Movements TW719
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Single line working P1 Single & Bi-directional P261
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Temporary Block Working - S5 Section 616
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Passing a signal at danger or an end of authority without a movement authority S517
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Dealing with a train accident or train evacuation M123
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Emergency Special Working S513
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Preparation and movement of trains TW188
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Observing and Obeying signalling indication S732
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Prep & movement of trains: Defective or Isolated on train equipment60
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Signals, Handsignals, Indicators and Signs RS52173
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Train stopped by failure M226
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Traction37
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General safety responsibilities and personal track safety for non-track workers G122
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General Track Safety32
