
The table below shows the required locking positions.
A lever number or name followed by 'N' means the lever must be in normal position.
Followed by 'R' means the lever must be in reversed position.
Lever no. followed by * indicate locking for flank protection or overlap protection. Note that the position of these levers may sometimes be either normal or reverse, but the lever is locked in that position when the signal is cleared.
Signals in opposite direction giving direct access to the route as indicated must always be at danger and are not explicitly listed in the table below. Signals in opposite direction which do not give direct access but must be at danger for overlap protection are included, and are indicated by *.

Column "calling on" indicates if the signal can be cleared on occupied track. 
When signal requires 'caution', the signal must be kept at danger until the speed of the train is sufficiently reduced (approx. 10 mph).

------------------------------------------------------------------
Sign|  Route to | Endsignal | Req levers |Call On | Notes
------------------------------------------------------------------
    |           |           |            |        |  
  C |     -     |     -     |01R,02R,03R,|        | Up Main Distant
    |           |           |  08R,09R   |        |  
    |           |           |            |        |  
  1 |  Up Main  |   02/10   | 'A'N,'B'N  |        | Caution if 02N
    |           |           |            |        |  and 10N
    |           |           |            |        |  
  2 |  Up Main  |    03     |    21N     |        | Caution if 03N
    |           |           |            |        |  
  3 |  Up Pform |    08     |19N,36N,41N,|        | Caution if 08N
    |           |           |  43N,67N   |        |  See note
    |           |           |            |        |  
  4 |     -     |     -     |05R,06R,08R,|        | Up Branch
    |           |           |    09R     |        |  Distant
    |           |           |            |        |  
  5 | Up Branch |   06/07   |    22N     |        | Caution if 06N
    |           |           |            |        |  and 07N
    |           |           |            |        |  
  6 |  Up Pform |    08     |24N,25N,26N,|        | Caution if 08N
    |           |           |36N,41R,67N |        |  See note
    |           |           |            |        |  
  7 |Dock Pform |    40A    |24N,25R,26N,|        |  
    |           |           |27R,31R,67N |        |  
    |           |           |            |        |  
  8 |  Up Main  |    09     |14N,16N,49N,|        | Caution if 09N
    |           |           |    50N     |        |  See note
    |           |           |            |        |  
  9 |  Up Main  |     -     |     LC     |        |  
    |           |           |            |        |  
 10 |North Curve|    11     |    21R     |        | Caution if 11N
    |           |           |            |        |  
 11 |Down Branch|    53A    |            |        | Caution if 53AN
    |           |           |            |        |  
 12 |North Curve|    13     |    22R     |        | Caution if 13N
    |           |           |            |        |  
 13 | Down Main |    52     |   'B'N     |        | Caution if 52N
    |           |           | also 21R*  |        |  
    |           |           |            |        |  
 15 |  Up Main  |    09     |  16R,141N  |        |  
    |           |           |            |        |  
 17 | Up Siding |     -     |    16R     |        |  
    |  Up Main  |    51     |    16N     |        |  
    |           |           |            |        |  
 18 | Down Main |   35/45   |19N,43N,67N |        |  
    |  Up Pform |    08     |19R,36N,41R,|        |  
    |           |           |  43N,67N   |        |  
    |           |           |            |        |  
 23 | Down Main |   35/45   |24N,43R,67N |   Y    |  
    |           |           | also 41R*  |        |  
    |  Up Pform |    08     |24R,25N,26N,|   Y    |  
    |           |           |36N,41R,67N |        |  
    | Dock Pform|   31/34   |24R,25R,26N,|        |  
    |           |           |  27R,67N   |        |  
    |           |           | also 30N*  |        |  
    |           |           |            |        |  
 29 | Dock Pform|   31/34   |27N,30R,67N |        |  
    |           |           |            |        |  
 31 | Dock Pform|    40A    |28N,32N,36N |   Y    |  
    |           |           |  also 39N  |        |  
    |Run Round R|     -     |  28N,32R   |   Y    |  
    |           |           |            |        |  
 33 | Branch Sdg|     -     |27N,28N,30R,|   Y    |  
    |           |           |  32R,67N   |        |  
    |Down Branch|    53     |24R,25R,26N,|        |  
    |           |           |27R,28N,32R,|        |  
    |           |           |    67N     |        |  
    |           |           | also 30N*  |        |  
    |           |           |            |        |  
 34 |  Up Pform |    08     |28N,32N,36R |   Y    |  
    |           |           |            |        |  
 35 | Down Pform|    48     |    46N     |   Y    |  
    |           |           |            |        |  
 38 | Down Pform|   56/57   |  36N,37N   |        |  
    | Branch Sdg|     -     |27N,28N,30R,|   Y    |  
    |           |           |32N,36R,37N,|        |  
    |           |           |    67N     |        |  
    |           |           |            |        |  
 40 | Dock Pform|    55     |    39N     |        |  
    |Run Round R|    33     |    39R     |        |  
    |           |           |            |        |  
 40A| Dock Pform|     -     |    39N     |        |  
    |           |           |            |        |  
 45 | Back Pform|    66     |    46R     |   Y    |  
    |           |           |            |        |  
 48 | Up Siding |     -     |  49R,50R   |        |  
    |  Up Main  |    09     |  49R,50N   |        |  
    | Down Main | Limit of  |  49N,64N   |        |  
    |           |  Shunt    |            |        |  
    |Down Siding|     -     |  49N,64R   |        |  
    |           |           |            |        |  
 51 |  Up Pform |    38     |  49N,50N   |   Y    |  
    | Down Pform|   60/61   |  49R,50N   |   Y    |  
    |           |           |            |        |  
 51A| Down Pform|   60/61   |  49R,50R   |   Y    |  
    |           |           |            |        |  
 52 | Down Main |     -     |    LC      |        |  
    |           |           |            |        |  
 53A|Down Branch|     -     |    LC      |        |  
    |           |           |            |        |  
 53 |Down Branch|    53A    |    22N     |        | Caution if 53AN
    |           |           |            |        |  
 54 | Down Main |    52     |   'B'N     |        | Caution if 52N
    |           |           |            |        |  
 55 |Down Branch|    53     |24R,25R,26N,|        |  
    |           |           |27R,28N,32N,|        |  
    |           |           |  36N,67N   |        |  
    |           |           | also 30N*  |        |  
    | Branch Sdg|     -     |27N,28N,30R,|   Y    |  
    |           |           |32N,36N,67N |        |  
    |           |           |            |        |  
 56 |Down Branch|    53     |24R,25N,26N,|        |  
    |           |           |41R,42N,67N |        |  
    |           |           |            |        |  
 57 | Down Main |    54     |19R,20N,41N,|        |  
    |           |           |42N,43N,67N |        |  
    |           |           |            |        |  
 58 |Down Branch|    53     |24N,43R,44N,|        |  
    |           |           |46R,47N,67N |        |  
    |           |           |  also 41R* |        |  
    |           |           |            |        |  
 59 | Down Main |    54     |19N,43N,44N,|        |  
    |           |           |46R,47N,67N |        |  
    |           |           |            |        |  
 60 |Down Branch|    53     |24N,43R,44N,|        | Caution if 53N
    |           |           |  46N,67N   |        |  
    |           |           |  also 41R* |        |  
    |           |           |            |        |  
 61 | Down Main |    54     |19N,43N,44N,|        | Caution if 52N
    |           |           |  46N,67N   |        |  
    |           |           |            |        |  
 62 | Down Pform|   60/61   |  49N,64N   |        | Caution if 60N
    |           |           | also 46N*  |        |  and 61N
    |           |           |            |        |  See note
    |           |           |            |        |  
 63 |    -      |     -     |52R,54R,61R,|        | Down Main
    |           |           |    62R     |        |  Distant
    |           |           |            |        |  
 65 | Down Pform|   60/61   |  49N,64R   |   Y    |  
    | Back Pform|   58/59   |    64N     |   Y    |  
    |           |           |            |        |  
 66 | Down Sdg  |     -     |    64N     |        |  
    |           |           |            |        |  
    |=============================================|  
    |           |           |            |        |  
    |             Groundframes                    |  
    |           |           |            |        |  
    |           |           |            |        |  
 A2 |Brantham Sd|     -     |    A1R     |        |  
    |           |           |            |        |  
 A3 |  Up Main  |   02/10   |    A1R     |        |  
    |           |           |            |        |  
 B2 |  Up Main  |   02/10   |    B1R     |        |  
    |           |           |            |        |  
142 | Up Siding |     -     |    141R    |        |  
    |  Up Main  |    51     | 14R,141N   |        |  
    |           |           |            |        |  
143 |  Up Main  |    09     |    141R    |        |  
    |           |           |            |        |  


Notes on caution :

signal 03 : caution not required if train is booked to stop or
            terminate at Manningtree
 
signal 06 : caution not required if train is booked to stop or
            terminate at Manningtree

signal 08 : caution not required if train is booked to exit
            to Up Siding

signal 62 : caution not required if train is booked to stop or
            terminate at Manningtree

Additional locking requirements :

-----------------------
 position  | requires
-----------------------
           |           
   27R     |   30N
   43R     |   41R
   A1R     |  'A'R
   B1R     |  'B'R
  141R     |   14R
           |

Special levers :
Release groundframe A:
  lever A reverse, requires 01N
  lever A reset to normal requires A1N

Release groundframe B:
  lever B reverse, requires 01N, 13N and 54N
  lever B reset to normal requires B1N

Release groundframe 14:
  lever 14 reverse, requires 08N
  lever 14 reset to normal requires 141N 

Level crossing :
  operated by single lever, 67.
  Reverse is crossing open, normal is crossing closed.

FPL :
Normal position is FPL locked.
Note : switches 21 and 22 are motor operated and therefor 
       not provided with FPL.

--------------------------
    FPL    | locks switch
--------------------------
           |    
    20     |      19
    26     |     24,25
    28     |    27,32,36(B)
    37     |      36(A)
    42     |      41
    44     |      43
    47     |      46
           |    
