computer science

OpenRailwayMap

OpenRailwayMap is a computer science topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand OpenRailwayMap rather than just read about it. In short: OpenRailwayMap (ORM) is an online collaborative mapping project developing a worldwide railway map using technology based on the OpenStreetMap project. The project is part of the OpenStreetMap database, and acts as a renderer for the existing OpenStreetMap database to include additional information for railroad lines worldwide.

Key takeaways

OpenRailwayMap belongs to computer science; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect OpenRailwayMap to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of OpenRailwayMap from memory before moving on to harder problems.

Reference excerpt

OpenRailwayMap (ORM) is an online collaborative mapping project developing a worldwide railway map using technology based on the OpenStreetMap project. The project is part of the OpenStreetMap database, and acts as a renderer for the existing OpenStreetMap database to include additional information for railroad lines worldwide. The project was launched in 2013.

History The project was started in 2011. The OpenRailwayMap website was launched in mid 2013. The map originally supported both raster tiles and vector tiles, but support for the latter was dropped in 2017 due to poor performance. A fork of OpenRailwayMap with a more modern vector tile implementation was announced in 2025.

Contents OpenRailwayMap contains data for railway line positions, as well as the following information about them: track type (i.e. bridge, tunnel, regular line); track line type and current use (i.e. main, branch, yard; construction, disused, abandoned); max rail speeds; train protection; track electrification and track voltage if applicable; and track gauge.

Applications Some of the uses for OpenRailwayMap are as follows: scientific models/simulations, data for model train enthusiasts, track information for trainspotters, and routing/public transport. As well as the project website there is also a mobile app available for Android devices.

API OpenRailwayMap has a public and free (albeit limited-use) API. It is designed for small-scale applications. Users can query for information such as rail locations and data related to the rail.

Contributing

OpenRailwayMap allows anyone to contribute in many ways, such as:

Creating data using photography or GPS trackers and sending it to experienced project editors Using the JOSM desktop editing tool to expand the database (Registration required with a verified email address, no registration required to view data) Contributing to the project's open source code

Internationalization OpenRailwayMap is available to users in around 22 languages.

References

External links

Official website OpenRailwayMap documentation on the OpenStreetMap Wiki

Illustrations

Worked examples

Example 1 — a first encounter with OpenRailwayMap

Start with the simplest possible case. Write down what OpenRailwayMap claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In computer science, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to OpenRailwayMap before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about OpenRailwayMap ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of OpenRailwayMap

In research: OpenRailwayMap appears in computer science research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses OpenRailwayMap in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: OpenRailwayMap is common in secondary-school and first-year university syllabi. It links to neighbouring topics 2013 software, Collaborative mapping, Creative Commons-licensed works, so understanding it makes those chapters shorter.
In everyday life: Look for OpenRailwayMap outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study OpenRailwayMap in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what OpenRailwayMap means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain OpenRailwayMap out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is OpenRailwayMap in simple terms?

Why does OpenRailwayMap matter?

Because it connects several computer science ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study OpenRailwayMap?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on OpenRailwayMap.