History
Reichsbahn
Originally, the railway company of each German state had its own signalling system. After these companies were merged into the German Imperial Railway (Post WWII
Two new companies were founded; theWest
TheEast
TheReunification
Several signalling systems and two sets of railway regulations exist within reunified Germany. The regulations are being gradually merged to form a single set, a process still in progress. Most of the network will come under the control of centralized signal boxes; during this process complete lines generally change to the new common Ks signalling system. However, old-style signals are still installed on a few new lines for various reasons, usually if no surrounding lines have Ks-type signals. Even new semaphores are still occasionally installed, though now mainly as spares in semaphore-only areas. Currently no new signalling system is being developed; the current systems are perfectly adequate for today's operations. The next step will be a system without fixed signals, based onThe different signal systems
The signal systems H/V (in both semaphore and lights-only implementations), Hl and Ks look quite different in appearance and differ in several details, but the safety principles are very similar, so the PZB safety system (see below) is used for all of them. (Note: the systems Sk and Sv are not covered by this article yet.) Most instances of the additional signal types (like Zs, Ne) can be combined with all the signal systems, e.g.: Zs 3(v) (speed limitation) appears with H/V and Ks, but Hl uses its own speed display; Zs 1 and Zs 8 appear with all of them, but in different shape. Lines without these signal systems exist: * high-speed lines may operate practically without visible signals (except for a fall-back) and PZB: they usePunktförmige Zugbeeinflussung (PZB)
A safety system with functionality similar to PZB is mandatory for nearly every train and most railroad lines in Germany (exceptions comprise shunting, single train operation, operation with very low speed, and freight-only operations). As said, LZB and ETCS lines may omit PZB for them providing its safety functionality. Segregated nets like theMain signal/distant signal (H/V) system
The most common system is the H/V (Hauptsignal/Vorsignal) system which consists of main signals and distant signals. Depending on the technology used in the signal box, these signals may be either semaphores or colour light signals. The colour lights show the same light patterns the semaphores show at night. The aspects shown here may be accompanied by Zs 2, Zs 2v, Zs 3, Zs 3v, Zs 6 (see section #Additional signals) or Lf signals (see section #Langsamfahrsignale) in order to show speed limits or the choice of track that follows. A main signal (with lights only) is marked by a ''Mastschild'' (board with a colour code) to protect in case of a signal lights failure. The location of a distant signal is marked by an Ne 2 (unless it is a repeater or it is at the location of a main signal) to prepare for the case where the signal lights fail.Hp 0: Stop
A main signal (''Hauptsignal'') shows Hp 0 by a horizontal semaphore arm, one red light or two horizontal red lights. The signal requires the driver to stop in front of it. (Originally, the aspect with two red lights was called Hp 00 and had a different meaning than a single red light with regards to shunting, see #Schutzsignale, but nowadays, the meaning is the same. )Vr 0: Expect stop
A distant signal (''Vorsignal'') shows Vr 0 by a yellow disc or two yellow lights (the right light is above the left light). This signal indicates that its respective main signal shows Hp 0. As the signal is placed atHp 1: Proceed
Aspect Hp 1, indicated by one raised semaphore arm or a single green light, allows the driver to proceed at the speed indicated in their schedule.Vr 1: Expect proceed
Vr 1 indicates that the main signal shows Hp 1. On a semaphore, the yellow disc is flipped horizontally through 90 degrees, while colour-light signals (or the semaphores at night) show two green lights with the right one above the left one.Hp 2: Proceed at reduced speed
If both arms of the semaphore point up, or a green light is show vertically above a yellow light, the train may proceed but at reduced speed. Unless another speed is indicated by additional signals, the train must obey a speed limit of 40 km/h, unless instructed otherwise (e.g. by an accompanying Zs 3 signal). Hp 2 indicates that the following track is free, but that the points/switches are set so as to make running over them at full speed dangerous.Vr 2: Expect proceed at reduced speed
Vr 2 orders the driver to slow the train to 40 km/h prior to reaching the main signal showing Hp 2. A different speed limit may be indicated by additional signals.Hl Signals
Hl-signals are used only in East Germany. An Hl signal consists of up to 5 lights, arranged in an "X" shape, and (if required) a yellow and/or a green horizontal light bar: * Upper left: Yellow, used for distant aspects * Upper right: Green, used for distant aspects (main aspect only if signal displays main aspects only) * Center: Red, stop signal * Lower left: Yellow, used for main aspects (proceed at limited speed) * Lower right: Replacement red, stop signal; used in case of central red light failure. Not all Hl signals contain all lamps described above. A pure distant signal contains only the two upper lamps, and a pure main signal displays the main aspect plus a green light instead of a distant aspect, therefore not needing the upper yellow light.Hl main aspects
The main aspects are displayed along with the current distant aspect (or green light if signal has no distant function). Additional light bars consist of (usually) four yellow or green lights in a horizontal row. * Red: Stop (distant aspect not displayed) * Yellow: Proceed at max. 40 km/h * Yellow + yellow bar: Proceed at max. 60 km/h * Yellow + green bar: Proceed at max. 100 km/h * None (distant aspect only): Proceed at maximum speedHl distant aspects
A distant aspect (or green in case of a pure main signal) is always shown unless the main aspect is stop (red). * Steady yellow: Expect stop * Flashing yellow: Expect proceed at max. 40 or 60 km/h * Flashing green: Expect proceed at max. 100 km/h * Steady green: Expect proceed at maximum speed.Examples
* Vmax -> 40 (60) km/h: Flashing (upper) yellow * 100 km/h -> Stop: Steady upper yellow (distant aspect), lower yellow, and green bar (main aspect) * 60 km/h -> 100 km/h: Flashing green, (lower) yellow, and yellow bar * 40 km/h -> Vmax: Steady green and (lower) yellow, no barKombinationsignale
After the reunification 1990, a new signalling system using ''Kombinationsignale'' (English: ''combination signals''; abbreviated as Ks) was designed to create a common system for East and West. While West Germany uses signals which simply show the night aspects of the semaphores, East Germany designed new light signals similar to those in other Eastern European countries. Since 2000, new signals have mostly been of the Ks system. There are exceptions; for example, H/V signals were installed on the light rail extension in Kassel post-2000 because the authorities wanted to avoid the risk of driver confusion on busy lines. The new Ks signals have three lights green, yellow and red, and have only three aspects. Basically, the signal meanings of the Ks signals match the ones of the H/V signals and vice versa, although the aspects may look different. The PZB and LZB technologies are used the same way as for H/V signals.Hp 0 Stop
One red light. The Ks system uses the same aspect for "stop" as the H/V system.Ks 1 Proceed at given speed, expect proceed at given speed
One green light. Additionally a white number above the signal (see Zs3) can reduce the speed. It shows the tenth of the speed limit from this signal. There may also be a yellow number below the signal (see Zs3v) showing the speed limit from the next signal, only shown if the speed limit at the next signal is reduced compared to the limit at the current signal. If such a yellow number is shown, the green light flashes.Ks 2 Proceed at given speed but expect stop
One yellow light. Speed can be reduced from here as described for Ks 1.Additional signals
A number of additional signals provide additional information to the driver or modify the meaning of other signals. They are named "Zs" (German ''Zusatzsignal'': Additional signal) plus a number. Some of the aspect names differ in East and West; those shown here are the names used in West Germany. Several signals (Zs 1, Zs 6, Zs 7 and Zs 8) were introduced to speed up operation; they replace written orders which take some time, even if transmitted by telephone or train radio (they are written down as heard, and read back, awaiting confirmation).Zs1 Ersatzsignal
Ersatzsignal = Subsidiary signal Three white lights aligned as a triangle (pointing upwards), or one flashing white light. Meaning: the train may pass the accompanying main signal (that shows 'halt' or no valid aspect) with a maximum speed of 40 km/h. Details: If there is a dark distant signal at the same place, at most this speed has to be used until the aspect of the following main signal is visible, and until that, it must be expected that the latter signal commands "halt". If the main signal is a (train station's) exit signal ("Ausfahrsignal"), this speed limit applies until the last set of points/switch has been passed by the complete train, after which regular speed is permitted. In case of entry and intermediate main signals of a train station ("Einfahrsignal"/"Zwischensignal"), the speed limit has to be obeyed until after the next main signal or up to the usual stopping location ("gewöhnlicher Halteplatz"). If several cases apply, the lowest speed given by any of them has to be followed.www.stelwerke.de: Zs 1Zs2 Richtungsanzeiger
Richtungsanzeiger = Direction indicator Shows one single white letter indicating the direction of the train's route. The letter is usually the initial letter of the next station or the next major station. This signal does not give any specific command to the driver, as signalling safety devices mean that being diverted to the wrong route is not necessarily dangerous. It does, however, prove to the driver whether the route is correctly set up, and if the route is wrongly set he could ask the signaler to re-set the route before starting the train.Zs2v Richtungsvoranzeiger
Richtungsvoranzeiger = Distant direction indicator Shows one single yellow letter, telling the driver how the route is set after the next signal. Meaning: Expect Zs2Zs3 Geschwindigkeitsanzeiger
Geschwindigkeitsanzeiger = Speed indicator Shows a white number indicating one tenth of the speed in km/h allowed after this point. Usually used in combination with main signals. Zs 3 are used for variable speed limits for different routes. Permanent speed restrictions are displayed using Lf plates.Zs3v Geschwindigkeitsvoranzeiger
Geschwindigkeitsvoranzeiger = Distant speed indicator Shows a yellow number indicating the tenth of the speed in km/h allowed past the following Zs3 signal. Usually used in combination with distant signals.Zs4/Zs5 Beschleunigungsanzeiger/Verzögerungsanzeiger (obsolete)
Beschleunigungsanzeiger = Acceleration display Verzögerungsanzeiger = Delaying display Used to indicate the train driver that he should accelerate or slow down to optimize the occupancy of the line. A train driver could slow down to avoid a signal showing "Stop" for himself, or accelerate to avoid a stop for the following train. They became obsolete when in the 1970s the first phones could be installed on trains.Zs6 Gegengleisanzeiger
Gegengleisanzeiger = Wrong line indicator Indicates that the train will be driving on the wrong line (left-hand) from this signal on. Used only on lines where wrong line working is frequent.Zs7 Vorsichtsignal
Vorsichtsignal = Caution signal Three yellow lights aligned as a triangle pointing down. Meaning: Train may pass this signal but must be prepared to stop at any obstacle. The speed has to be chosen according to visibility, but must not exceed 40 km/h. Used only in combination with main signals. This signal is used for the same cases as Zs1. The difference is that for a Zs1 it is checked ''for'' the driver that the line is clear, whereas at a Zs7 the train driver must check ''for themselves'' that the line is clear.Zs8 Gegengleisfahrt-Ersatzsignal
Gegengleisfahrt-Ersatzsignal = Wrong line subsidiary signal Three white flashing lights aligned as a triangle or a flashing diagonal light Indicates that a signal at danger may be passed when wrong line working is in force. If the signal guards points/switches the speed limit is 40 km/h; otherwise, the limit is 100 km/h to the next station. As with other 'wrong line operation' signals, this is only used where wrong line operation is frequent.Zs10 Endesignal
Endesignal = Ending Signal This Signal indicates that any speed restrictions given by Hp2 or Zs3 end with the rear of the train passing this signal. This signal is no longer erected, but existing installations are kept.Langsamfahrsignale
Langsamfahrsignale = Slow travel signal (speed limit) There are several plates to display speed limits, of two basic types: signs showing the maximum speed and, where the speed limit drops, advance warning signs. The Lf1, Lf4 and Lf6 plates are advance warning boards, while the Lf2, Lf5 and Lf7 announce the start of speed limits. The Lf3 plate marks the end of temporary speed limits, but the end of a permanent speed limit was not usually shown. Changes as of 2007: Lf4/Lf5 are obsolete and are being replaced by Lf6/Lf7; An increase in speed limit will now always be shown by a Lf7.Nebensignale
Nebensignale (possible translations: auxiliary/lateral signals) are signals that do not fit in any other category; some of them give hints rather than requiring action.Ne 1 Trapeztafel
Trapeztafel = Trapezoid board Meaning: Stop here to await permission to proceed. Trains must stop here to wait for visual or verbal signal to proceed. Found on lightly-used lines where telephone block operation (without signals) is in force and at double-tracked lines at the left track at the entry to a station if no other signal is installed; it effectively replaces a station's entry signal.Ne2 Vorsignaltafel
Vorsignaltafel = Distant signal board Used alone or in combination with a distant signal. Meaning: This is a distant signal. (It may be used stand-alone or to indicate the actual distant signal at the same place. Note that a semaphore distant signal may not show a visible aspect when showing Vr 1.) A main signal, shunting signal or a Ne1 will be found at braking distance. Unless a distant signal, distant signal repeater or main signal is visible, the train driver treats this signal as "Vr0 or Ks2: Expect Stop". Every distant signal is mounted with a Ne2 plate to mark their position (if this plate was not fitted, the driver would not know if he had passed the distant signal or not when showing aspect Vr1, since in this position it is practically invisible). Distant signal repeaters or distant signals mounted in combination with a main signal do not have a Ne2 plate.Ne3 Vorsignalbaken
Vorsignalbaken = Distant signal beacon Used to announce distant signals. Posted 250m, 175m and 100m before distant signal. Generally 3 plates are used, but up to 5 may be used at hard-to-see locations. Fewer than 3 are used if the distance from the previous main signal is too small to install them all.Ne4 Schachbretttafel
Schachbretttafel = Checkerboardplate Used to indicate that a main signal is not in its usual position (i.e. if the signal is further to the right than normal or if it is on the wrong side of the track to aid visibility). This plate is posted where the signal would be if conditions were normal.Ne5 Haltetafel
Haltetafel = Stop board Used to indicate where at the platform a passenger train should stop. It can be combined with additional signs indicating what types of trains should stop here, e.g. "240 m" for trains at most this length.Ne6 Haltepunkttafel
Haltepunkttafel = Stopping point board Meaning: Expect a stopping point within braking distance. This is only used to announce halts that are not stations.Ne7 Schneepflugsignal
Schneepflugsignal = Snowplough signal Gives information to snowplough crews. A yellow or white 'V' shape indicates 'lower snowplough', an inverted yellow or white 'V' indicates 'raise snowplough'. These are placed to warn the crew to raise the snowplough so as to avoid hitting any obstructions at rail level, such as level crossings/grade crossings.Schutzsignale
Schutzsignale = protection signals. (This section uses the terminology for West Germany, whereas ex-DR uses different names.) These signals used to control only shunting movements, but nowadays, they apply to trains as well. Shunting movements do not leave a station whereas train movements do. These signals are sometimes combined with main signals, which is the reason why main signals sometimes have one red light and sometimes two. Historically, shunting movements were allowed to ignore main signals. They had to stop only at main signals with two red lights, because a double red light means Hp 0 (stop for train movements) and additionally Sh 0 (stop for shunting movements). When they were allowed to pass this signal, it showed a red and two white lights, still forbidding train movements (Hp 0 + Sh 1). After a change, a red signal always means stop for all movements. Therefore, only one red light is needed (a double red has the same meaning), so single red lights will be used for new installations.Catenary Signals/''Fahrleitungssignale''
All these signals consist of a blue diamond-shaped board with various patterns of white markings. As such, only the white markings are described in this section. As catenary signals, they apply only to electric trains.El1v
Two horizontally-aligned square white dots, on centreline of board. This warns the driver to switch off the locomotive's main switch.El1
Similar to El1v but with a horizontal line under the square dots (dots do not join the line). Locomotive's main switch must be off when this board is passed.El2
A square U-shape. Main switch can be turned on after this board.El3
Two horizontal lines across the board, about one quarter and three-quarters of the way down it. Warns driver to lower the locomotive's pantograph.El4
One horizontal line across the centre of the board. Pantograph must be down when this board is passed.El5
Vertical line through the centre of the board. Pantograph may be raised after passing this board.El6
Concentric squares of blue and white. Indicates 'stop for vehicles with raised pantographs'. This sign is most commonly seen at the end of the catenary.Examples
Example 1
Entering a station (see image) Left: Secondary line with minimum signalling Right: Main Line with standard signallingExample 2
The lower track is blocked. A train going from left to right cannot use the regular track. It must use the wrong track. The exit-signal of the left station shows Hp0 (one or two red lights: "Stop"), because there is no regular route to the wrong track. The signal shows also Zs8 (three white flashing lights: "Proceed on wrong track"). The signal cannot show Sh1 ("Shunting allowed") in this case, because the ride would end at the Ra10-plate ("Stop for shunting movements"). When approaching the next station, the train will find an Ne2-plate, which substitutes a distant signal and in this case means "Expect Stop". At the position of the entry-signal of the right station, a Ne4 plate shows that a signal is not where it is expected. Instead, the signal is mounted right of the track. This signal shows Sh1 (two white lights: "Shunting allowed"), the train may enter the station. The signal could also stand on the left side of the track, the Ne4 plate is not used then.Example 3
This is an explanation of how Kennlichts are used with signals placed at half braking distance. Usually, trains will encounter signals such as the first one shown, which indicates Hp1/Vr1 as described in the H/V section of this article, meaning the line is clear. The first indication of a need to brake is Hp1/Vr0, which means "proceed, expect stop at braking distance". On the next signal, a Kennlicht, which means that the main signal is switched off is combined with distant signal showing Vr0 + Zusatzlicht (also a white lamp, but not to be confused with a Kennlicht), which means "expect stop before braking distance". The last one shows the expected "stop".Gallery
Footnotes
1: A white cross (with a black border) on a signal informs the driver to disregard the signal.Zusammenstellung der Bestimmungen der Eisenbahn-Signalordnung 1959See also
* Bavarian railway signalsReferences
External links