Through the medium of animation with voice-over, this video introduces part 2 of Cōnsilium Aquīs Sulis's course on GB Mainline Signalling.

Module 2 of GB Mainline Signalling Part 2: points locking.
Through the medium of animation with voice-over, this video covers the following topics:
- point key requests
- route locking of points
- points deadlocking
- foul track locking

Module 3 of GB Mainline Signalling Part 2: route locking.
Through the medium of animation with voice-over, this video covers the following topics:
- route requests
- testing points free to move
- testing opposing locking
- setting a route and applying route locking.

Module 4 of GB Mainline Signalling Part 2: displaying a proceed aspect.
Through the medium of animation with voice-over, this video covers the following topics:
- displaying a proceed aspect for a route
- disengagement and automatic working
- automatic signals
- signal replacement.

Module 5 of GB Mainline Signalling Part 2: approach locking and route release.
Through the medium of animation with voice-over, this video covers the following topics:
- cancelling a route
- application of approach locking
- approach locking release
- sectional route release
- anti-bob protection.

Module 6 of GB Mainline Signalling Part 2: directional controls.
Through the medium of animation with voice-over, this video covers the following topics:
- bi-directional lines
- establishing direction
- bi-directional automatic sections
- re-enforced locking.

Through the medium of animation with voice-over, this video covers the following topics:
- locking overlaps
- swinging overlaps
- release of overlaps
- phantom overlaps.

Module 8 of GB Mainline Signalling Part 2: overlap detection and Time of Operation Locking.
Through the medium of animation with voice-over, this video covers the following topics:
- train detection sections in overlaps
- detection of points in overlaps
- Time of Operation Locking.

Module 9 of GB Mainline Signalling Part 2: diamond crossings, trap and flank protection.
Through the medium of animation with voice-over, this video covers the following topics:
- trap protection
- flank protection
- diamond crossings.

Module 10 of GB Mainline Signalling Part 2: reminder devices and technician's controls.
Through the medium of animation with voice-over, this video covers the following topics:
- What are reminder devices?
- Types of reminder device
- What are technician's controls?
- Types of technician's controls.

Module 11 of GB Mainline Signalling Part 2: signal groups.
Through the medium of animation with voice-over, this video covers the following topics:
- Signal Group Replacement Controls (SGRCs)
- Predetermined Overrun Protection (POP) groups.

Module 12 of GB Mainline Signalling Part 2: Revision.
Through the medium of animation with voice-over, this video summarizes part 2 of Cōnsilium Aquīs Sulis's course on GB Mainline Signalling.