M1
| TD | Address | bit | Meaning when '1' | Observed by |
|---|---|---|---|---|
| M1 | 00 | 0 | LL1577 (Position light ground signal.) off. | 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 LL3584 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 bits 02 0 and 02 2 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 |
| M1 | ?? | ? | Not yet seen. Route set LL1577 to Huyton P2. | 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.
"Not seen" indicates a bit which has always been 0.
There is at least one signal and one route setting which have not been used since the signalling was commissioned and so are missing from the listing.