Here is the list of signals as given by the CSX rules (1987)

Rules 280 through 297 apply exclusively on the former Seaboard System

\ /
-O-  means flashing light
/ \

[p] means permissive signal(most restrictive indication is Restricted Proceed)

[1]
[2]
[3] or [123] is a numberplate on the signal.

o means a light not lit (I think) It shows as gray in the rulebook

O shows as white in the rule book, used for an APP marker

281

  high signal     dwarf signal
          [ ]
          [ ]
  g  g  g  g

  r  r  
                    g
  r                 g

Name: Clear   Indication: Proceed

281-B

  y   y   y
 \ / \ /  \ /
 -g- -g-  -g-        y
 / \ / \  / \       \ /
  r                 -g-
                    / \

Name:Approach Limited  Indication: Proceed, approaching next signal not
                                   exceeding Limited Speed. Limited Speed
                                   through turnouts.

281-C

  r   r
 \ / \ /
 -g- -g-             r
 / \ / \            \ /
  r                 -g-
                    / \

Name:Limited Clear     Indication: Limited speed through turnouts and 
                                   crossovers; then proceed.

281-D

  r   r
 \ / \ /
 -y- -y-             r
 / \ / \            \ /
  r                 -y-
                    / \

Name:Limited Approach  Indication: Limited speed through turnouts and
                                   crossovers; then proceed, prepared
                                   to stop at next signal.

282

  y  y  y

  g  g   g
                     y
  r                  g

Name:Approach Medium   Indication: Proceed, approaching next signal not
                                   exceeding Medium Speed. Medium speed
                                   through turnouts.

282-A

  y  y \ / \ / 
       -y- -y-
  y  y / \ / \
        r
  r  

Name:Advance Approach  Indication: Proceed, preparing to stop at second signal

283

  r  r

  g  g
                     r
  r                  g

Name:Medium Clear      Indication: Medium speed through turnouts and 
                                   crossovers; then proceed

283-A

  r

  y
                     y
  y                  y

Name:Medium Advance Approach   Indication: Medium speed through turnouts and 
                                           crossovers; then proceed, prepared 
                                           to stop at second signal.

283-B

  r

  y

  g

Name:Medium Advance Slow   Indication: Medium speed through turnouts and 
                                       crossovers; then proceed, approaching
                                       next signal not exceeding slow speed.

284

  y  y

  r   r

  g   g

Name: Approach Slow    Indication: Proceed, approaching next signal not
                                   exceeding slow speed.

285

  y  y  y   /\
           / /
  r  r     y/ 

  r

Name: Approach         Indication: Proceed, prepared to stop at next signal.

286

  r  r

  y  y
                     r
  r                  y

Name: Medium Approach  Indication: Medium speed through crossovers; then
                                   proceed, prepared to stop at next signal.

287

  r

  r
                     g
  g                  r  g

Name: Slow Clear       Indication: Slow speed through turnouts and 
                                   crossovers; then proceed.

288

  r

  r
                     y
  y                  r  y

Name: Slow Approach    Indication: Slow speed through turnouts and
                                   crossovers; then proceed, prepared to
                                   stop at next signal.

290

  r r o o r o

  r o r r o
                     o r
  o r r              r o o

Name: Restricting      Indication: Proceed at restricted speed.

291
             __
  r  r  r  r[__]

  r  r  
       [p] 
  r [1]   [1]        r  [p]
    [2]   [2]        r   r
 [p][3]   [3]      [123]

Name: Restriced Proceed  Indication: Proceed at restricted speed.

292
             __
  r  r  r  r[__]

  r  r
                     r
  r                  r  r

Name: Stop             Indication: Stop.

293

  r  r    Note: Stop and Check signal is designated by "C" marker.

  r
 [c][c]             [c]
                     r

Name: Stop and Check   Indication: Stop and check position of drawbridge,
                                   spring switch, derails, or gates protecting
                                   railroad crossings. If way is clear and 
                                   drawbridge, spring switch, derails or gates
                                   are in proper position, proceed at
                                   restricted speed.

294

  r  r  r    Illuminated "S"

  r  r  r
                     r
  r                  r   r [s]
 [s][s][s]          [s] [s] r

Name: Stop and open switch   Indication: Stop and open hand-operated switch.

295

  O   O   O  A signal equipped with "APP" marker provides
             information only about the next signal, not
  O   O      conditions of the track ahead.

  O
                    app
 app app app         O

Name: APP Marker        Indication: Proceed, approaching next signal as 
                                    authorized by the aspect displayed. If
                                    signal is dark, proceed prepared to stop
                                    at next signal until it can be plainly
                                    seen that indication of next signal allows
                                    train to proceed.

Rules 296 and 297 are used for bracketed signals used on signal
bridges, or adjusted according to fit the situation needed.