Blocking back Flashcards
What is the bellcode for blocking back inside home signal? TS1-2 (1)
2-4 (with call attention).
What is the bellcode for blocking back outside home signal? TS1-2 (1)
3-3 (with call attention)
What is the bellcode for obstruction removed? TS1-2 (1)
2-1-2 (with call attention)
When can blocking back inside home signal be used? TS3-3.6.1 (5)
Any movement that will be stopped on the running line.
If work will affect the safety of the line is to take place within the clearing point as shown in TS1-13.2.
A work-site marker board for a T3 Possession, or work that will make the line unsafe within that worksite.
An out-of-gauge movement.
Any other obstruction.
Before using blocking back inside home signal, what criteria must be met with bellcodes and block indicator position? TS3- 3.6.1 (2)
Train out of section must have been sent.
Block indicator must be normal.
When receiving blocking back inside home signal; what must you do with your block indicator? (1)
Nothing, signal box sending blocking back places block indicator to train on line.
If you have acknowledged Blocking Back inside home signal, you must not send ‘is line clear’ unless… TS3-3.6.2 (2)
Restricted acceptance is authorised.
Obstruction removed has been received.
When blocking back is no longer required, what bellcode must be sent? TS3-3.6.3 and TS3-3.6.8
2-1-2 obstruction removed
What must you do if you receive 5-5-5 from the Signal Box in rear, while your clearing point is obstructed, after you have acknowledged 5-5-5? TS3-3.6.4 (2)
Immediately send 2-4 to Signal Box in rear.
Once 2-4 is acknowledged, place block indicator to train on line.
True or false; transferring blocking back inside to outside…allow movement to happen before bellcode? TS3-3.6.9 (1)
False; send 3-3 and get it acknowledged before allowing move to happen.
True or false; transferring blocking back outside to inside…allow movement to happen before bellcode? TS3-3.6.10 (1)
True; allow movement to happen before sending 2-4
