# Schematic Transit Diagram (Beck Tube Map Idiom)

> A diagram idiom for rail networks that puts topology before geography: lines run only horizontally, vertically or at 45 degrees, stations sit at even intervals, each line has its own colour, and the real shape of the city is bent to fit. Born with Harry Beck's London Underground diagram, it was copied for metro and rail maps worldwide. Its real lineage, electrical circuit diagrams, is not in the atlas, so it has no parent here; the palette listed is modern TfL line colours, not Beck's 1933 palette.

- Period: 1931–present
- Where: Western Europe, Global / networked
- Origin: London, where Harry Beck, a former Underground signals draughtsman, drew an uncommissioned schematic diagram in 1931; a small pocket edition reached the public in 1933 after a 500-copy trial in 1932
- Branch: Rational modernism
- Also known as: Octilinear transit map, Beck diagram, Subway diagram, Metro map
- Page: https://stylogeny.com/styles/transit-diagram-map/

## How it works

- Draw every line only horizontally, vertically or at 45 degrees.
- Space stations at near-equal intervals, ignoring true distance.
- Give each line one flat colour and keep it unbroken from end to end.
- Mark interchanges with a distinct ticks-to-circles or diamond symbol.
- Distort the city's geography freely to keep the network legible, and keep the river only as a simple band.
- Set all labels in one sans face at a few fixed sizes, placed clear of the lines.

## Its design choices

Defining choices make the style, characteristic ones are usual, occasional ones turn up now and then.

### Layout & composition
- [Diagonal axis](https://stylogeny.com/design-choices/diagonal-axis/) (defining)
- [Modular grid](https://stylogeny.com/design-choices/modular-grid/) (characteristic)
- [Dynamic asymmetry](https://stylogeny.com/design-choices/dynamic-asymmetry/) (occasional)

### Space & hierarchy
- [Measured density](https://stylogeny.com/design-choices/measured-density/) (defining)
- [Repetition & rhythm](https://stylogeny.com/design-choices/repetition-and-rhythm/) (defining)
- [Layered information](https://stylogeny.com/design-choices/layered-information/) (characteristic)
- [Flat hierarchy](https://stylogeny.com/design-choices/flat-hierarchy/) (occasional)

### Typography
- [Humanist sans](https://stylogeny.com/design-choices/humanist-sans/) (defining)
- [Grotesque & neo-grotesque](https://stylogeny.com/design-choices/grotesque-and-neo-grotesque/) (occasional)
- [Flush left, ragged right](https://stylogeny.com/design-choices/flush-left-ragged-right/) (occasional)

### Colour
- [Full polychrome](https://stylogeny.com/design-choices/full-polychrome/) (defining)
- [Flat fields](https://stylogeny.com/design-choices/flat-fields/) (defining)
- [Light ground](https://stylogeny.com/design-choices/light-ground/) (characteristic)

### Form & shape
- [Rectilinear](https://stylogeny.com/design-choices/rectilinear/) (defining)
- [Non-representational](https://stylogeny.com/design-choices/non-representational/) (characteristic)
- [Pictogram](https://stylogeny.com/design-choices/pictogram/) (occasional)

### Surface & texture
- [Flat](https://stylogeny.com/design-choices/flat/) (defining)

### Ornament
- [Ornament-free](https://stylogeny.com/design-choices/ornament-free/) (defining)

### Imagery
- [Diagram & data](https://stylogeny.com/design-choices/diagram-and-data/) (defining)
- [Icons & pictograms](https://stylogeny.com/design-choices/icons-and-pictograms/) (occasional)
- [Flat vector illustration](https://stylogeny.com/design-choices/flat-vector-illustration/) (occasional)

### Medium & production
- [Architecture & signage](https://stylogeny.com/design-choices/architecture-and-signage/) (characteristic)
- [App & OS interface](https://stylogeny.com/design-choices/app-and-os-interface/) (characteristic)
- [Web & CSS](https://stylogeny.com/design-choices/web-and-css/) (characteristic)
- [Offset printing](https://stylogeny.com/design-choices/offset-printing/) (occasional)

### Tone & intent
- [Rational & objective](https://stylogeny.com/design-choices/rational-and-objective/) (defining)
- [Technological & futurist](https://stylogeny.com/design-choices/technological-and-futurist/) (occasional)
- [Authoritative & institutional](https://stylogeny.com/design-choices/authoritative-and-institutional/) (occasional)

Avoids: Abundant decoration, Horror vacui, Ornamented display, Whiplash line, Naturalistic depiction, Skeuomorphic material, Straight photography

Palette: #f6f3ea, #dc241f, #0019a8, #007229, #b36305, #000000

Typefaces: Johnston, Helvetica

Known for: Harry Beck, London Underground diagram (drafted 1931, 500-copy trial 1932, pocket edition January 1933); Sydney Suburban and City Underground railway map (1939), a close follower of Beck's styling; Massimo Vignelli, New York subway map (1972); Mark Noad's more geographically accurate Tube map (2011), using 30 and 60 degree angles; Max Roberts's concentric-circle Tube map (2013)

## Where it comes from, and what it’s close to

- Alike in its design choices: [Contemporary Arabic & Dual-Script Type Design](https://stylogeny.com/styles/arabic-latin-bilingual-type.md) (2004–present), 72% alike
- Alike in its design choices: [Flat Design](https://stylogeny.com/styles/flat-design.md) (2010–2016), 70% alike
- Alike in its design choices: [Metro (Microsoft Design Language)](https://stylogeny.com/styles/microsoft-metro.md) (2010–2017), 66% alike
- Alike in its design choices: [Isometric Tech Illustration](https://stylogeny.com/styles/isometric-tech-illustration.md) (2015–present), 65% alike
- Alike in its design choices: [HfG Ulm Systematic Design](https://stylogeny.com/styles/ulm-school.md) (1953–1968), 64% alike
- Alike in its design choices: [Legible City Wayfinding (Heads-Up Pedestrian Maps)](https://stylogeny.com/styles/legible-city-wayfinding.md) (1999–present), 64% alike

## Sources

- https://en.wikipedia.org/wiki/Tube_map
- https://en.wikipedia.org/wiki/Harry_Beck

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From Stylogeny (https://stylogeny.com/), an atlas of graphic-design styles by Van Riel Online Services. How it is made: https://stylogeny.com/about/. Cite as: Stylogeny, “Schematic Transit Diagram (Beck Tube Map Idiom)”, https://stylogeny.com/styles/transit-diagram-map/