Understanding Railway Signals: Hp, Ks, Vr and What They Mean for Spotters

Updated: August 2026 – Experienced spotters sometimes seem almost psychic: they raise the camera before anything can even be heard. The trick is signal knowledge. This guide doesn’t explain the complete signalling rulebook, but treats understanding railway signals as a tool: the ten terms that genuinely give you advance warning at a photo spot – and the cases where signals let you down.

What do railway signals show, and how does that help spotters?

Railway signals regulate whether and how fast a train may proceed through a section of line. For observers, the key piece of information is this: a home signal changing from stop to proceed means a train movement has been set up – something is about to arrive.

Distant signals are even more useful. They show, one braking distance before the home signal, what that signal allows – on many lines around 1,000 metres ahead. Anyone keeping an eye on a distant signal gets extra lead time to prepare the camera, exposure and framing. This pairs well with the basics in the tips for new trainspotters, which focus on choosing a spot itself.

The two signal systems you’ll actually encounter

In Germany, you’ll come across mainly two systems in everyday spotting. They differ in construction, not in purpose. Beyond the border, different rulebooks apply: signalling technology and the electrification system in Denmark are the responsibility of Banedanmark. In Sweden, the authority in charge was for decades called Banverket – the name still appears on lineside equipment to this day.

The H/V system: separate home and distant signals

The older home/distant signal system works with two separate signal types. At the home signal:

• Hp 0 – stop, red light.
• Hp 1 – proceed, green light.
• Hp 2 – reduced speed, green and yellow.

The associated distant signal announces what applies at the next home signal:

• Vr 0 – expect stop, two yellow lights.
• Vr 1 – expect proceed, two green lights.
• Vr 2 – expect reduced speed, green and yellow.

Semaphore signals with moving arms work on the same logic and today survive only in a few places – usually where older signal box technology is also still preserved. How these installations connect is described in the guide to signal boxes from mechanical to digital.

The Ks system: everything in one head

The combination signal (Ks) merges the home and distant signal functions. It’s mainly found on newer and modernised installations and is recognisable by a single, compact signal head:

• Green light – proceed, the following signal also shows proceed.
• Flashing green light – proceed, but a speed restriction is to be expected at the following signal.
• Yellow light – expect stop at the following signal.
• Red light – stop.

For spotters, the practical difference is this: with the Ks system, the advance warning sits in the same signal you’re already watching. With the H/V system, you also need to keep an eye on the distant signal, which often stands well outside the station.

Signal terms at a glance

Signal / term	Aspect	Meaning	Value at the photo spot
Hp 0	Red	Stop	No train movement set up on this section
Hp 1	Green	Proceed	Train movement set up – get the camera ready
Hp 2	Green and yellow	Reduced speed	Train arrives more slowly, longer window
Vr 0	Two yellow	Expect stop	Train will stop before the next signal
Vr 1	Two green	Expect proceed	Non-stop passage likely, full speed
Ks (green)	Green	Proceed	Like Hp 1, advance warning included
Ks (yellow)	Yellow	Expect stop	Train is already braking
Distant signal board	Diagonal stripes	Distant signal follows	Point of reference in the field
Auxiliary indicator	Number on the signal	Permitted speed	Hint at a junction or reduced speed

The last row is especially useful at a photo spot: a speed indicator often points to a train crossing a set of points and therefore travelling more slowly – which noticeably extends your time window. How to use those extra seconds is covered in the guide on how to photograph a moving train.

What signal aspect are you looking at?

Using signals in practice: the advance warning time

The real value comes from turning signal observation into a routine.

Which focal length makes sense here depends on your distance from the track – the article on choosing a focal length for train photography covers that. And if you want to keep several signals in view at once, choosing your spot from the guide to railway photography with tips and locations is worth it.

How much advance warning a signal really gives you

The advance warning time isn’t a fixed value – it depends on three factors: the distance between distant and home signal, the permitted speed, and your own position relative to the signal.

A rough guide: with a signal spacing of around 1,000 metres and a speed of around 100 km/h, roughly 35 to 40 seconds pass between the train passing the distant signal and reaching the home signal. At 160 km/h it’s considerably less; with a regional train slowly pulling away, noticeably more. But what counts for you isn’t the time between the two signals, but the time between the signal change and the train’s appearance – and that’s usually longer, because the route is often set well before the train is even in sight.

In practice this means: a signal change usually gives you enough time to check exposure and settle on your framing, but not enough to change position. If you’re torn between two spots, decide before the change happens. And if you’re at a station with several approach routes, you gain the most by keeping an eye on the signals for both directions – then the change tells you not just that something’s coming, but also from which side.

Common mistakes when reading signals

• Inferring the train type from the signal. A proceed aspect says nothing about whether a freight train, a regional train or a shunting movement is coming.
• Watching the wrong signal. Stations have multiple signals for different tracks. Work out first which one belongs to your track.
• Confusing distant and home signals. A distant signal showing “expect proceed” isn’t a movement authority – the train could still be far away.
• Counting shunting signals. Shunting movements use their own signal aspects; they don’t announce a train movement on the line.
• Relying on signals where none exist. With in-cab signalling, there’s no visual advance warning at all. How to plan there is covered in the article on how to track a moving train.
• Ignoring legal boundaries. What may and may not be photographed depends on the location and must be assessed case by case – the basics are set out in the overview are you allowed to photograph trains?

Conclusion

Signal knowledge isn’t an end in itself for spotters – it’s a matter of preparation time. Anyone who can tell Hp 0 from Hp 1, keeps a distant signal in view and reads Ks signals correctly no longer raises the camera on a hunch. At the same time, the system has its limits: signals announce movements, not vehicles – and on modern lines they disappear altogether. Such conversions are planned and accompanied by engineering firms like IGEBA, recognisable lineside by survey crews and covered-up signals. The best preparation therefore combines the signal aspect with a data source. Where you can bring both together well is shown in the overview of the best stations for trainspotting in Germany.