
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
------------------------------------------------------------------
    |           |           |            |        |  
            WEST Box
    |           |           |            |        |  
  6 |     -     |     -     |     07R    |        | Up Main Distant
    |           |           |            |        | Slotted by 104
    |           |           |            |        |  
  7 |  Up Main  |    105    |04N,14N,30N,|        |  
    |           |           |  37N,110N* |        |  
    |           |           |            |        |  
  8 | Down Main |     24    |04N,16R,17R,|        |  
    |           |           |    37N     |        |  
    |           |           |            |        |  
 13 |  Up Main  |    105    |04N,14R,30N,|        |  
    |           |           |  37N,110N* |        |  
    |  Gasworks |     -     |01N,14N,41N |        |  
    |           |           |            |        |  
 15 | Up Sdg (W)|     -     |    14R     |        |  
    |           |           |            |        |  
 18 |to Station |     27    |  43N,42R   |        |  
    |  Gasworks |     -     |03N,19R,41R,|        |  
    |           |           |    43R     |        |  
    |           |           |            |        |  
 20 | Up Sdg (W)|     -     |01N,14N,41N |        |  
    |  Nevill's |     -     |03N,19R,41R,|        |  
    |           |           |    43R     |        |  
    |           |           |            |        |  
 22 |Dn Goods Lp|     -     |04N,16R,17R,|        |  
    |           |           |    37N     |        |  
    |           |           |            |        |  
 23 | Down Main |     22    |04N,25N,28N,|        | Advance route
    |           |           |  30N,37N   |        |  indication
    |           |           |also 16R,17R|        | Caution if 22N
    |           |           |            |        |  
 24 | Down Main |     29    |    25N     |        |  
    |Station Sdg|     -     |  25R,28N   |  yes   |  
    |           |           |            |        |  
 26 | Down Main |     33    |  25R,28N   |        |  
    |           |           |    37N     |        |  
    |           |           |            |        |  
 27 |  Up Main  |    105    |  28R,30R,  |        |  
    |           |           |   110N*    |        |  
    |           |           |            |        |  
 27A|to Station |     27    |  19N*,42N  |        |  
    |           |           |  also 3R*  |        |  
    |           |           |            |        |  
 29 | Down Main |    113    |  28N,30N   |  yes   |  
    |  Up Main  |    105    |  28N,30R,  |  yes   |  
    |           |           |   110N*    |        |  
    |           |           |            |        |  
 31 |  Up Main  |     15    |04N,30N,37N |        |  
    | Down Main |     33    |25N,28N,30R |        |  
    |  Glanmor  |     -     |19N,28R,30R,|        |  
    |           |           |    42N     |        |  
    |           |           |  also 3R*  |        |  
    |  Nevill's |     -     |28R,30R,42R,|        |  
    |           |           |    43N     |        |  
    |           |           |            |        |  
 32 |Old Castle |     -     |            |        | requires LC
    |           |           |            |        |  
 33 | Down Main |     32    |04N,16N,17R,|        | Caution if 32N
    |           |           |    37N     |        |  
    |           |           |            |        |  
 34 | Down Main |     33    |04N,16N,17R,|        | Advance route
    |           |           |25N,28N,30N,|        |  indication
    |           |           |    37N     |        | Caution if 33N
    |           |           |            |        |  
 35 |     -     |     -     |32R,33R,34R |        | Down Main Distant
    |           |           |            |        |  
    -----------------------------------------------
            EAST Box
    |           |           |            |        |  
104 |     -     |     -     | 105R,107R  |        | Up Main Distant
    |           |           |            |        |  
105 |  Up Main  |    107    | 102N,110N, |        | Caution if 107N
    |           |           | 115N,117N, |        |  
    |           |           |    120N    |        |  
    |           |           |            |        |  
106 |  Up Main  |    107    | 102N,109R, |        |  
    |           |           | 110R,115N, |        |  
    |           |           | 117N,120N  |        |  
    |           |           |            |        |  
107 | Llanelly  |     -     |            |        | requires LC
    |  Dock Jn  |           |            |        |  
    |           |           |            |        |  
111 |  Up Main  |     31    | 102N,110N  |  yes   |  
    |  Up Bay   |     -     | 102N,109R, |  yes   |  
    |           |           |    110R    |        |  
    |           |           |            |        |  
113 | Down Dock |     -     | 102N,115N, |        |  
    |           |           |    124R    |        |  
    |  Up Main  |    107    | 102N,115R, |        |  
    |           |           | 117N,120N  |        |  
    |Up Sdg (E)	|     -     | 102N,115R, |        |  
    |           |           |    117R    |        |  
    |           |           |            |        |  
116 |  Up Main  |    111    | 115N,117N  |        |  
    | Down Main |     34    | 102N,115R, |  yes   |  
    |           |           |    117N    |        |  
    |           |           | also 25N*, |        |  
    |           |           | 28N*,30N*  |        |  
    |           |           |            |        |  
118 | Down Main |     34    | 102N,115R, |  yes   |  
    |           |           |    117R    |        |  
    |           |           | also 25N*, |        |  
    |           |           | 28N*,30N*  |        |  
    |           |           |            |        |  
119 |  Up Main  |    107    |    120R    |        |  
    |           |           |            |        |  
121 |  Up Main  |    116    |    120N    |        |  
    |Up Sdg (E) |     -     |    120R    |        |  
    |           |           |            |        |  
126 | Down Main |     34    | 102N,115N, |  yes   | Caution if
    |           |           |    124R    |        | calling on
    |           |           | also 25N*, |        |  
    |           |           | 28N*,30N*  |        |  
    |           |           |            |        |  
129 | Down Main |     34    | 102N,115N, |        |  
    |           |           |    124N    |        |  
    |           |           | also 25N*, |        |  
    |           |           | 28N*,30N*  |        |  
    |           |           |            |        |  
130 |    -      |     -     |    129R    |        | Up Main Distant
    |           |           |            |        |  

 
Additional locking requirements :

-----------------------
 position  | requires
-----------------------
           |           
    14     | 02N       
    19     | 03N,41R,43R
    41     | 02N       
           |           

Level crossings :
 Glanmor Road :
    36 : Gates, requires 37R
    37 : Lock, requires 36N

 New Dock Road :
   101 : Gates, requires 102R
   102 : Lock, requires 101N

Gaswork siding gates :
    from/to Up Siding :
     1 : Lock in open position, requires 2A reverse
     2 : Lock in closed position, requires 2A normal
    2A : Gate, requires 1R and 2R

    crossing main line :
     3 : Lock in open position, requires 4A reverse
     4 : Lock in closed position, requires 4A normal
    4A : Gate, requires 3R and 4R

FPL :

--------------------------
    FPL    | locks switch
--------------------------
           |    
    17     |  16
   109     | 110
           |    
