M1
| TD | Address | bit | Meaning when '1' | Observed by |
|---|---|---|---|---|
| M1 | 00 | 0 | Not seen. | Phil Wieland |
| M1 | 00 | 1 | LL3572 off. | Phil Wieland |
| M1 | 00 | 2 | LL3573 off. | Phil Wieland |
| M1 | 00 | 3 | LL3574 off. | Phil Wieland |
| M1 | 00 | 4 | LL3575 off. | Phil Wieland |
| M1 | 00 | 5 | LL3576 off. | Phil Wieland |
| M1 | 00 | 6 | LL3577 off. | Phil Wieland |
| M1 | 00 | 7 | LL3578 off. | Phil Wieland |
| M1 | 01 | 0 | LL3579 off. | Phil Wieland |
| M1 | 01 | 1 | LL3580 off. | Phil Wieland |
| M1 | 01 | 2 | LL3581 off. | Phil Wieland |
| M1 | 01 | 3 | LL3582 off. | Phil Wieland |
| M1 | 01 | 4 | LL3584 off. | Phil Wieland |
| M1 | 01 | 5 | LL3585 off. | Phil Wieland |
| M1 | 01 | 6 | LL3586 off. | Phil Wieland |
| M1 | 01 | 7 | LL3587 off. | Phil Wieland |
| M1 | 02 | 0 | LL3590 off. | Phil Wieland |
| M1 | 02 | 1 | LL3591 off. | Phil Wieland |
| M1 | 02 | 2 | LL3592 off. | Phil Wieland |
| M1 | 02 | 3 | LL3593 off. | Phil Wieland |
| M1 | 02 | 4 | LL3739 off. | Phil Wieland |
| M1 | 02 | 5 | LL3745 off. | Phil Wieland |
| M1 | 02 | 6 | LL3746 off. | Phil Wieland |
| M1 | 02 | 7 | LL3749 off. | Phil Wieland |
| M1 | 03 | 0 | LL3750 off. | Phil Wieland |
| M1 | 03 | 1 | LL3754 off. | Phil Wieland |
| M1 | 03 | 2 | LL3755 off. | Phil Wieland |
| M1 | 03 | 3 | LL5579 off. | Phil Wieland |
| M1 | 03 | 4 | LL5583 off. | Phil Wieland |
| M1 | 03 | 5 | LL9588 off. | Phil Wieland |
| M1 | 03 | 6 | Not seen. | Phil Wieland |
| M1 | 03 | 7 | Not seen. | Phil Wieland |
| M1 | 04 | 0 | Not seen. | Phil Wieland |
| M1 | 04 | 1 | Not seen. | Phil Wieland |
| M1 | 04 | 2 | Not seen. | Phil Wieland |
| M1 | 04 | 3 | Not seen. | Phil Wieland |
| M1 | 04 | 4 | Not seen. | Phil Wieland |
| M1 | 04 | 5 | Not seen. | Phil Wieland |
| M1 | 04 | 6 | Not seen. | Phil Wieland |
| M1 | 04 | 7 | Not seen. | Phil Wieland |
| M1 | 05 | 0 | Unidentified. Seen to change. Stays at 1 during normal ops. | Phil Wieland |
| M1 | 05 | 1 | Unidentified. Seen to change. Stays at 1 during normal ops. | Phil Wieland |
| M1 | 05 | 2 | Route set LL3585 to LL3587 Down Chat Moss to Huyton P1. | Phil Wieland |
| M1 | 05 | 3 | Route set LL3585 to LL5579 Down Chat Moss to Huyton P2. | Phil Wieland |
| M1 | 05 | 4 | Route set LL3586 to LL3754 Huyton P3 to Up St Helens. | Phil Wieland |
| M1 | 05 | 5 | Route set LL3586 to LL3587 Huyton P3 to Up Chat Moss. | Phil Wieland |
| M1 | 05 | 6 | Unidentified. Seen to change. Stays at 1 during normal ops. | Phil Wieland |
| M1 | 05 | 7 | Route set LL3591 to LL3593 Roby P1 towards Liverpool | Phil Wieland |
| M1 | 06 | 0 | Unidentified. Seems to relate to signals 20 and 22 but it's not LL3590BR because I have seen it off when 3590 is on. | Phil Wieland |
| M1 | 06 | 1 | Route set LL3755 to LL5579 Down St Helens to Huyton P2 | Phil Wieland |
| M1 | 06 | 2 | Route set LL3755 to LL9591 Down St Helens to Huyton P3. | Phil Wieland |
| M1 | 06 | 3 | Route set LL5583 to LL3593 Roby P2 towards Liverpool | Phil Wieland |
| M1 | 06 | 4 | Route set LL9588 to LL3584 Huyton P2 to Up Chat Moss. | Phil Wieland |
| M1 | 06 | 5 | Not seen. | Phil Wieland |
| M1 | 06 | 6 | Not seen. | Phil Wieland |
| M1 | 06 | 7 | Not seen. | Phil Wieland |
| M1 | 07 | 0 | Not seen. | Phil Wieland |
| M1 | 07 | 1 | Not seen. | Phil Wieland |
| M1 | 07 | 2 | Not seen. | Phil Wieland |
| M1 | 07 | 3 | Not seen. | Phil Wieland |
| M1 | 07 | 4 | Not seen. | Phil Wieland |
| M1 | 07 | 5 | Not seen. | Phil Wieland |
| M1 | 07 | 6 | Not seen. | Phil Wieland |
| M1 | 07 | 7 | Not seen. | Phil Wieland |
Note - In the absence of confirmation of how signalling engineers number the bits, this list uses bit 0 for the LSB to bit 7 for the MSB of each byte.