Absolute Block Working

Question 1

When will Absolute Block Working be implemented?

Answer 1

• when track maintenance machines or vehicles are required to travel through the section
• A rail traffic movement fails to be detected by the signal control system
• Any other circumstance where is deemed necessary for the MTM chief engineer or MTM manager network safety such as consecutive signal failures with a section

Question 2

What is the object of Absolute Block Working?

Answer 2

• to prevent more than one rail traffic movement being in the section of track between the defined absolute block working limits at the same time
• to prevent a rail traffic movement from entering absolute block working limits whilst proceeding rail movement is occupying the defined limits concerned.

Question 3

Block signalling? How will the object be achieved?

Answer 3

Once the vehicle/train has entered the section, the signal must return the absolute signal to stop position and a block Command placed on the signal.

Question 4

What are the two types of Absolute Block Working?

Answer 4

• Controlled absolute signal
• Nominated clearance point

Question 5

What classes of signals are considered to be Absolute?

Answer 5

home, dwarf, disc

Question 6

How will Absolute Block Working be implemented on a Single Line section?

Answer 6

Question 7

What will happen if the train detection system fails?

Answer 7