Pictures of Hp Colour Light Signals

Köln-Ausfahrsignale Exit signals at Köln Hbf facing east (towards the Rhine bridge). Click at the picture for the full image.

To the far left of the full image you see a line-close signal displaying a Kennlicht (marker light) to indicate that it is operationally switched off and can be ignored.
The main signal displays green-over-amber, that is aspect Hp 2: slow. The slanted head below is the distant signal displaying two green lights, that is Vr 1: expect clear. To indicate that the next signal is at reduced distance, the distant signal shows an additional white light.
To the upper left of the main signal we see a direction indicator displaying the letter "L", so the route is set to the left of the two southern bridges, i.e the centre bridge. The left (northernmost) bridge cannot be reached from these signals.

To the right we see another combination of destination indicator, main and distant signals. The right main signal also displays Hp 2 while the associated distant signal displays two amber lights (Vr 0: expect stop). The next signal is also at reduced distance (hence the white light), and the direction indicator displays an "R", so the exit route is set to the right (i.e. southernmost) bridge.

The signal in the centre (to the far right of the picture) displays Hp 0: stop, and therefore the distant signal is dark.
Köln-Ausfahrsignale The same situation some moments later:

You see a green circle to the lower left of the left main signal head. That is the Zp 9 departure order signal, telling the train driver to depart. Also, the distant signal at the right track has changed to Vr 1: expect clear.
Langsamfahrt mit 30 km/h erwarten, ggf. Einfahrt in Stumpfgleis  A distant signal at Vr 2: expect slow. Below you see a Zs 3v speed announcing signal. The announced speed is 30 km/h. Far below there is an Ne 2 board (distant signal post plate). To the left we see an hectometre board, telling us we're at kilometre 2.2.
Langsamfahrt mit 30 km/h, Halt erwarten  1000 m behind the distant (look at the hectometre board: we're at kilometre 1.2 now), from top to bottom we see: A Zs 3 speed signal imposing 30 km/h, a main signal at Hp 2: slow (which would be 40 km/h if there was no Zs 3), a distant signal showing Vr 0: expect stop, and the main signal's post plate.

Note that the shapes of the Zs 3 and Zs 3v are irrelevant (the triangle could face up or down or could be missing), a Zs 3 has white numbers and a Zs 3v amber ones.

Fahrt mit 60 km/h, freie Fahrt erwarten  At Ahrensburg, track 3 towards Hamburg, the left exit signal shows green-yellow. This is aspect Hp 2: clear with medium speed. The distant signal below displays Vr 1: expect clear. The additional white light indicates that the distance to the next main signal is shorter than usual. The triangular sign is a Zs 3 board imposing a speed limit of 60 km/h in the following points zone. Far below is the white-red-white post plate.

The signal to the right shows Hp 0 with the (now obsolete) double-red aspect. The distant signal is dark. Note that this signal is lower, because it is behind a bridge and must be seen from the platform before that bridge.

Between the main and distant heads you can see a small square box, that is a Zs 1 substitution signal.

Ausfahr-Vor- und Hauptsignale  The same signal. To the left you see a distant signal repeater that is used to indicate the aspect of the exit signal which is hidden behind the bridge.
Hp 0: Halt  A close-up of the exit signals towards Hamburg-Rahlstedt.
Ausfahr-Vorsignal: Vr 0-Halt erwarten  Northbound, towards Bargteheide, this distant signal repeater is located under the platform roof to indicate the exit signal aspect for passing trains.
Gleiswechselanzeiger als Formsignal  The trains that leave the left tracks will continue in the left track after exiting the station, so the corresponding exit signals carry a Zs 6 track changing indicator board.
Zs 3-Geschwindigkeitssignal  Southbound exit signals at Bargteheide. The centre signal carries a Zs 3 speed signal for trains that had halted on the left or centre track and will switch to the right track on the open line. The signal in the background, next to the loco, is a Zs 6 track changing indicator. The square boxes below the main signal heads carry three white light to display a Zs 1.

The box with the "F" is the signal telephone.

Ausfahrsignale, 500 Hz-Magnet  In the lower right, you see the 500 Hz Indusi magnet protecting the right exit signal.
Vorsignal mit Kompaktsignalschirm  Here you see three signals at a platform at Hamburg Hbf, track 12. (Click on the picture for a larger version)

To the left there is a line-close signal which currently displays a marker light (Kennlicht) to indicate that is currently has no operational significance. Sometimes two trains can halt at the same platform, in that case, the signal displays Sh 0 (line closed) so that the platform track is separated into two blocks.

The signal on the top right is a brake test signal, and to the lower right, we see a distant signal.

This distant signal shows Vr 0 (expect stop) and indicates the aspect of the exit signal which is not visible from here as it is hidden behind the platform roof, so it is closer than braking distance (as is indicated by the additional white light).

This signal does not have the usual slanted shape but a more modern (and space saving) compact head.

Hauptsignal zeigt Kennlicht Trains halting at Hamburg Hbf, track 14, may leave the station straight or diverging to the left through the point between the two signals.

If the point is set to diverging, the train would have to halt at the first signal to the right, which would then display Hp 0 (stop). In case that the point is set to straight (as in this picture), the train has to stop at the H board which is barely visible here at the building in the background, and clearance would be given by the main signal in the background.
In that case, the main signal in front is meaningless and operationally switched off. To distinguish it from a failed (i.e. dark) signal, a single white light, the Kennlicht (marker light) is lit.
Halt für Zugfahrten, Rangiervorbot aufgehoben  An exit signal at Hamburg Hbf displaying Hp 0+Sh 1: stop for trains, shunting permitted. below you see the signal number plate (S10), a Zs 3 speed signal permitting max. 30 km/h and the white-red-white post plate making this signal absolute.
Kennlicht  When a signal is operationally switched off, it is not dark but displays a Kennlicht (marker light), to distinguish it from a failed signal. So the white light means: Treat this signal as if not existent.

The full picture shows also a triangular Zs 3 speed signal. The diamond-shaped sign to the right is an El 6 announcer for the end of catenary.

Ersatzsignal  The same signal displaying a Zs 1 Ersatzsignal (substitution signal, the three small white lights below the main signal head). This is used to allow the train to pass in case that the signal has failed or cannot be switched to clear due to interlocking problems.
zs7hp.jpg (31042 Byte)  Top to bottom:

Zs 3 speed signal (extinct), main signal head at stop, Zs 7 subsidiary signal, and a distant signal head with additional light to indicate that the following main signal is closer than braking distance.

The Zs 7 means that the signal may be passed at danger, and the driver has to drive on sight towards the next main signal.

Below the distant head you see the signal number plate, see numbering of signals.