Changes

! Photo !! Track Element !! Signal Type !! Description

! Photo !! Track Element !! Signal Type !! Description

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| || || Two-Aspect || The simplest type which can display aspects of <i>Clear</i> and <i>Danger</i>

| [[File:Railway signal, Holywood - geograph.org.uk - 3935474.jpg|200px]] || || Two-Aspect || The simplest type which can display aspects of <i>Clear</i> and <i>Danger</i>

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| [[File:Railway_signal,_Sydenham,_Belfast_-_geograph.org.uk_-_4050207.jpg|300px]] || || Three-Aspect || Displays aspects of <i>Clear</i>, <i>Danger</i> and <i>Caution</i>, with the last aspect indicating either that the next signal is at <i>Danger</i>, or the route is terminating.

| [[File:Signal PD4, Parbold railway station (geograph 4531216).jpg|200px]] || || Three-Aspect || Displays aspects of <i>Clear</i>, <i>Danger</i> and <i>Caution</i>, with the last aspect indicating either that the next signal is at <i>Danger</i>, or the route is terminating.

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| || || Four-Aspect || Displays all aspects described above with the addition of <i>Preliminary Caution</i> which indicates the next signal is at <i>Caution</i>.

| [[File:Signals at Westbury 29 Apr 2010.jpg|200px]] || || Four-Aspect || Displays all aspects described above with the addition of <i>Preliminary Caution</i> which indicates the next signal is at <i>Caution</i>.

| [[File:Low shunting signal.jpg|200px]] || || Shunt Signal || Used for shunt movements, has two aspects either <i>Clear</i> or <i>Danger</i>.

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