
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
------------------------------------------------------------------
    |           |           |            |        |  
 01 | Platf 5   |     -     |23N,24R,25N,|        |  
    |           |           |26R,33N,37R,|        |  
    |           |           |38N,39R,44R |        |  
    |           |           |    45R     |        |  
    |           |           |            |        |  
    |           |           |23N,24R,25N,|        |  
 02 | Platf 4   |     -     |26N,32N,37R,|        |  
    |           |           |38N,39R,44R,|        |  
    |           |           |46R,47R,48N |        |  
    |           |           |            |        |  
 03 | Platf 3   |     -     |23N,24N,25N,|        |  
    |           |           |37R,38N,39R,|        |  
    |           |           |40N,41R,51N |        |  
    |           |           |            |        |  
 04 | Platf 2   |     -     |22N,23N,24N,|        |  
    |           |           |25N,37R,38N,|        |  
    |           |           |39R,40R,41R,|        |  
    |           |           |42R,64N,69N,|        |  
    |           |           |70N,71R,75N |        |  
    |           |           |            |        |  
 08 | Up Sdg 2  |     -     |    10R     |        |  
    | Up Main   |    12     |    10N     |        |  
    |           |           |            |        |  
 11 | Up Main   |    78     |  09N,10R   |        |  
    | Gas Works |     -     |  09R,10R,  |        |  
    |           |           |  G1R,G2R   |        |  
    |           |           |            |        |  
 12 | Up Sdg 1  |     -     |    13R     |        |  
    | Up Main   | 27/35/36  |    13N     |        |  
    |           |           |            |        |  
 14 | Up Main   |    93     |    13R     |        |  
    |           |           |            |        |  
 15 | No.1 Sdg  |     -     |23R,25R,26R,|  Yes   |  
    |           |           |33R,39R,44R,|        |  
    |           |           |    45R     |        |  
    |           |           |            |        |  
 16 | Platf 5   |     -     |23R,25R,26R,|  Yes   |  
    |           |           |33N,39R,44R,|        |  
    |           |           |    45R     |        |  
    |           |           |            |        |  
 17 | Platf 4   |    46     |23R,24R,25R,|  Yes   |  
    |           |           |26N,32N,39R,|        |  
    |           |           |41R,44R,47R |        |  
    |           |           |    48N     |        |  
    |           |           |            |        |  
    |           |           |also 46R is |        |  
    |           |           |  allowed   |        |  
    |           |           |            |        |  
 18 | Middle Sdg|    50     |23R,24R,25R,|  Yes   |  
    |           |           |26N,32N,39R,|        |  
    |           |           |41R,44R,46R,|        |  
    |           |           |  47R,48R   |        |  
    |           |           |            |        |  
    |           |           |also 50R is |        |  
    |           |           |  allowed   |        |  
    |           |           |            |        |  
 19 | Platf 3   |     -     |23R,24N,25N,|  Yes   |  
    |           |           |40N,41R,51N |        |  
    |           |           |            |        |  
 21 | Platf 2   |     -     |22R,23N,40N,|  Yes   |  
    |           |           |42R,64N,69N,|        |  
    |           |           |70N,71R,75N |        |  
    |           |           |            |        |  
 27 | Up Main   | 28/29/30  |    38N     |        |  
    |           |           |            |        |  
 28 | Platf 4   |    46     |24N,26N,32N,|  Yes   |  
    |           |           |  44R,47R   |        |  
    |           |           |            |        |  
 29 | Platf 5   |     -     |24N,26N,32R,|  Yes   |  
    |           |           |33N,44R,45R |        |  
    |           |           |            |        |  
 30 | No.1 Sdg  |     -     |24N,26N,32R,|  Yes   |  
    |           |           |33R,44R,45R |        |  
    |           |           |            |        |  
 34 | Up Main   |    93     |13N,24N,26N,|        |  
    |           |           |32R,33R,38N,|        |  
    |           |           |  44R,45R   |        |  
    |  Loco 1   |     -     |23R,25R,26R,|        |  
    |           |           |33R,39R,44R,|        |  
    |           |           |    45R     |        |  
    |           |           |            |        |  
 35 | Platf 3   |     -     |23N,24N,25N,|  Yes   |  
    |           |           |37R,38R,39R,|        |  
    |           |           |40N,41R,51N |        |  
    |           |           |            |        |  
 36 | Platf 2   |     -     |22N,23N,24N,|  Yes   |  
    |           |           |25N,37R,38R,|        |  
    |           |           |39R,40R,41R,|        |  
    |           |           |42R,64N,69N,|        |  
    |           |           |70N,71R,75N |        |  
    |           |           |            |        |  
 46 | Platf 4   |     -     |   47R,48N  |See Note|  
    | Middle Sdg|    50     |   47R,48R  |  Yes   |  
    |           |           |            |        |  
 49 | Platf 4   |   91/99   |   47R,48R  |        |  
    |           |           |            |        |  
 50 | Middle Sdg|     -     |    51N     |  Yes   |  
    | Platf 3   |     -     |    51R     |        |  
    |           |           |            |        |  
 52 | Platf 3   |   90/98   |    51N     |  Yes   |  
    | Middle Sdg|    49     |    51R     |  Yes   |  
    |           |           |            |        |  
 57 | Platf 2   |     -     |59R,60R,64N,|See Note|  
    |           |           |65R,70R,71R,|        |  
    |           |           |    75N     |        |  
    |           |           |            |        |  
 58 | Platf 1   |    73     |59R,60N,61R,|See Note|  
    |           |           |62R,74R,75N |        |  
    |           |           |            |        |  
    |           |           |also 73R is |        |  
    |           |           | allowed    |        |  
    |           |           |            |        |  
 63 | Platf 2   |     -     |60N,64R,65R,|  Yes   |  
    |           |           |70R,71R,75N |        |  
    |           |           |            |        |  
 68 | Platf 2   |     -     |69R,70N,71R,|  Yes   |  
    |           |           |    75N     |        |  
    |           |           |            |        |  
 73 | Platf 1   |     -     |  74R,75N   |        |  
    | Platf 2   |     -     |  74R,75R   |        |  
    |           |           |            |        |  
 76 | Platf 2   |    86*    |    75N     |        |  
    | Platf 1   |  81/74    |  74R,75R   |        |  
    |           |           |            |        |  
 78 |Llanbadarn |     -     |            |        | Requires LC
    |           |           |            |        |  
 79 | Platf 1   |    73     |61N,62R,80R |  Yes   |  
    |           |           |            |        |  
 81 | Branch Sdg|     -     |61N,62R,80R |  Yes   |  
    |           |           |            |        |  
 82 | Field Sdg |     -     |60N,64R,65R |        |  
    |           |           |            |        |  
 83 | Llanilar  |           |            |        | Requires LC
    |           |           |            |        |  
 84 |  Branch   |    83     |59R,60N,61R,|        |  
    |           |           |    62R     |        |  
    |           |           |  See Note  |        |  
    |           |           |            |        |  
 85 |  Branch   |    83     |59R,60R,64N,|        |  
    |           |           |    65R     |        |  
    |           |           |  See Note  |        |  
    |           |           |            |        |  
 86 |  Branch   |   82/85   |  70R,71R   |        |  
    |           |           |            |        |  
 88 |  Loco 2   |     -     |64N,69R,70N |        |  
    |           |           |    71R     |        |  
    |           |           |            |        |  
 89 |  Loco 1   |     -     |22R,23N,40N,|        |  
    |           |           |    42R     |        |  
    |           |           |            |        |  
 90 |  Loco 1   |     -     |23R,24N,25N,|        |  
    |           |           |  40N,41R   |        |  
    |           |           |            |        |  
 91 |  Loco 1   |     -     |23R,24R,25R,|        |  
    |           |           |26N,32N,39R |        |  
    |           |           |    44R     |        |  
    |           |           |            |        |  
 92 |  Loco 1   |     -     |23R,25R,26R,|        |  
    |           |           |33N,39R,44R,|        |  
    |           |           |    45R     |        |  
    |           |           |            |        |  
 93 |  Up Main  |    78     |  09N,10N   |        |  
    |           |           |            |        |  
 94 |  Up Main  |    93     |13N,24N,26N,|        |  
    |           |           |32R,33N,38N,|        |  
    |           |           |  44R,45R   |        |  
    |           |           |            |        |  
 95 |  Up Main  |    93     |  37R,38R   |        |  
    |           |           |            |        |  
 96 |  Up Main  |    93     |22N,23N,24N,|        |  
    |           |           |25N,39R,40R,|        |  
    |           |           |41R,42R,95R |        |  
    |           |           |            |        |  
 97 | Platf 2   |   89/96   |64N,69N,70N |        |  
    |           |           |    71R     |        |  
    |           |           |            |        |  
 98 |  Up Main  |    93     |23N,24N,25N,|        |  
    |           |           |39R,40N,41R,|        |  
    |           |           |    95R     |        |  
    |           |           |            |        |  
 99 |  Up Main  |    93     |13N,24N,26N,|        |  
    |           |           |32N,38N,44R |        |  
    |           |           |            |        |  
100 | Platf 4   |   91/99   |  47R,48N   |        |  
    |           |           |            |        |  
 G3 | Up Sdg 2  |     -     |08R,09R,10R,|        |  
    |           |           |  G1R,G2R   |        |  
    |           |           |            |        |  

Notes :

 46 : 
  calling on is allowed if train is stopped at signal.
  However, if the signal is cleared as part of a through route
  from another signal, whether or not calling on is allowed
  depends on the condition for that signal.

 57, 58 :
  calling on is allowed for local shunt moves but not for
  trains coming off the branch.

 84, 85 :
  signal may not be cleared for shunt moves if there is a train
  in the section between Aberystwyth and Llanilar.

 
Additional locking requirements :

-----------------------
 position  | requires
-----------------------
           |           
    60     |   61N
           |

Special lever :

 09 : releases groundframe (G1, G2, G3).
      Released by 10R, 78N.
      Locks 10.
      Locked by G1.

FPL :

--------------------------
    FPL    | locks switch
--------------------------
           |    
    37     |    38
    39     |   24 26
    41     |   23 40 
    42     |    40
    44     |   24 26
    45     |    33
    47     |    48
    59     |    60
    62     |    61
    65     |    60
    71     |   69 70 
    74     |    75
           |    
    G2     |    G1
           |    
