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Signalling Display Symbols
Ground Frames

Signalling Display Symbols


This section will take you through all of the symbols used in SimSig, which in most cases are identical to those used in real life. Please note that this section covers only standard symbols- some Simulations contain symbols which do not appear in any other Simulation to represent unusual signalling arangements. Therefore, if you can't find the symbol you're looking for here, please consult the relevant Simulation Manual .


Track is shown as solid grey lines on the screen. The general orientation is left-to-right, top-to-bottom, but complex areas require variations. In any case, the continuation of track is identified by simple letters such as "A", meaning the track continues at the other "A" elsewhere on the same screen. On Paged simulations, alpha-numeric labels such as "A2" or "2A" are used. The letter is the connection name, and the number shows the screen number that the other end of the connection is on.

Get to know the layout of the area you are controlling - it will help enormously! Usually a page in each simulation's manual will describe the area in detail.

Symbol Meaning
Track Track Circuit not occupied by train
Occupied Track Track Circuit occupied by train, or a track circuit that has failed*
Route Set Track with route set
Non-track-circuited track Non-track-circuited track, or else track not controlled by your signalbox
Siding Siding where trains cannot enter/exit the Simulation
Overlap End of overlap (With the Show track circuit breaks option turned on)
Engineering Possession Track under an engineering possession
Traction Isolation Track under a traction isolation
Engineering and Traction Isolation Track under an engineering possession and a traction isolation
Blocked to Electric Traction Track Blocked to Electric Traction
Engineering Possession and Blocked to Electric Traction Track under an engineering possession and Blocked to Electric Traction

*Although both appear as red stripes, a failed TC does not appear to be associated with any train in the area, e.g., does not move and has no berth .


See also

Signalling Principles , Signal Aspects

Signals are shown as a variety of shapes and orientations. These are best shown pictorially as follows:


Symbol Direction of travel / Running line
:usertrack:ssrun:sigrb.png Right -> Below signal
:usertrack:ssrun:sigra.png Right -> Above signal
:usertrack:ssrun:sigla.png <- Left Above signal
:usertrack:ssrun:siglb.png <- Left Below signal

Signal Types

Symbol Type
:usertrack:ssrun:sigcont.png Controlled signal at danger (red lamp) but a route set from it (the white stem)
:usertrack:ssrun:sigcontpos.png Controlled signal with position light subsidiary aspect not currently lit
:usertrack:ssrun:sigauto.png Automatic signal. Note different stem shape.
:usertrack:ssrun:sigext.png Signal controlled by another signalbox
:usertrack:ssrun:sigshunt.png Shunt signal (displaying "proceed")
:usertrack:ssrun:sigfail.png Unlit signal. Either the signal is Approach Lit , or it has failed .
:usertrack:ssrun:banner_1.png OR
Banner Repeater signal
:usertrack:stopboards.png?100 Stop Boards

Other signal controls

Symbol Usage
:usertrack:ssrun:buttonexit.png Exit button for either a bay platform/siding or a signal on another view
:usertrack:ssrun:buttoncall.png Exit button selecting a shunt route
:usertrack:ssrun:buttoncallred.png Either: Exit button selecting a call-on route.
Or: Entrance button for use with cross-boundary route setting. Refer to simulation manual for operation instructions.
:usertrack:ssrun:buttonwarn.png Exit button selecting a warner route
:usertrack:ssrun:buttonvia.png Via button (intermediate routing button) applying in indicated direction only*
:usertrack:ssrun:viaroundel2.png Via button (intermediate routing button) applying in both directions*
:usertrack:ssrun:buttautooff.png Control for selecting automatic working for the adjacent controlled signal (inactive)
:usertrack:ssrun:buttautoon.png Control for selecting automatic working for the adjacent controlled signal (active)
:usertrack:ssrun:buttemeroff.png Control for replacing adjacent automatic signal to red (inactive) - the letter "R" is also used
:usertrack:ssrun:buttemeron.png Control for replacing adjacent automatic signal to red (active) - the letter "R" is also used
TC override Track Circuit Override (inactive)
TC override Track Circuit Override (active)

*Used for selecting alternative routes. See Via Button .


:usertrack:ssrun:sigisolgen.png Signal with general reminder applied
:usertrack:ssrun:sigisolt.png Signal with traction isolation reminder applied
:usertrack:ssrun:sigisolgandt.png Signal with both reminder types applied


Symbol Description
:usertrack:ssrun:letchstn.png A typical station (Letchworth) with two numbered platforms, two tracks, and various signals.


Using the Display options , it is possible to select whether points always show the position they are currently lying in (more recent UK standards), or to only show the position if they are locked (original UK standards).

:usertrack:ssrun:point_unlocked.png Point not locked
:usertrack:ssrun:point_keyed.png Point keyed manually into position
:usertrack:ssrun:point_keyed_reminder.png Point keyed manually into position with reminder applied
:usertrack:ssrun:point_locked.png Point flank locked by another route
:usertrack:ssrun:point_flashing.png Point out of correspondence (flashing; colour depends on whether keyed or locked)
:usertrack:ssrun:point_sprung.png Sprung point . The $ symbol indicates that a set of points are sprung, and the signaller may not have control over their position.
:usertrack:ssrun:catch_point.png Catch point - a safety device used to derail runaways, with the aim of avoiding collision with another train. Exact symbol varies, however in all cases it will appear as a set of points with one exit ending immediately.
Wide to gauge Wide-to-gauge catch point


:usertrack:ssrun:diamond_jn.png Diamond junction or crossing. One track (not necessarily the same gauge) crosses over another with no moveable parts.
Diamond junctions are not points, as trains cannot be switched from one track to the other. See here for example.
:usertrack:ssrun:switch_diamond.png Switch diamond - a diamond crossing with moveable parts that need to be set in the correct position for trains to run over it.


Slots in SimSig are a catch-all description for slots, releases, acceptances, and other means of indicating that somebody has given permission somewhere.

:usertrack:ssrun:slot_inactive.png? Slot not requested
:usertrack:ssrun:slot_requested.png? Slot requested (flashing solid/hollow white)
:usertrack:ssrun:slot_active.png? Slot granted


Symbol Meaning
TRTS TRTS indicator (deactivated)
TRTS TRTS indicator (activated) (white light flashes)
TRTS TRTS indicator embedded in platform (deactivated)
TRTS TRTS indicator embedded in platform (activated) (white light flashes)


Symbol Meaning
:usertrack:ssrun:train-arsactiv.png Train running with ARS (also colour of TDs on non-ARS simulations)
:usertrack:ssrun:train-arsdeactiv.png Train not running with ARS
:usertrack:ssrun:train-arspattern.png ARS routing train according to Special Timing Pattern
:usertrack:ssrun:ars-subactiv.png ARS subarea (activated)
:usertrack:ssrun:ars-subdeactiv.png ARS subarea (deactivated)

Ground Frames

Symbol Meaning
:usertrack:ssrun:gfnormal3.png Ground Frame Normal
:usertrack:ssrun:gffree2.png Ground Frame free to move (white circle flashes)


Symbol Meaning
:usertrack:ssrun:platform.png Platform
:usertrack:ssrun:level-crossing.png Level Crossing
:usertrack:ssrun:tunnel.png Tunnel
:usertrack:ssrun:signalbox.png Signalbox. Different simulations illustrate signalboxes in different ways, but the two shown opposite are the main types of design. (In case this isn't immediately obvious, the inverted V symbol in the upper pic and the horizontal bar in the lower pic represent the signal panel. The solid white dot in the lower pic represents (a plan view of) the head of the signaller looking at the panel. Whether the signaller is facing or has his back to the railway line (or even at right angles to the line) depends on a range of factors.)

Last edited by postal on 10/04/2021 at 12:52