---
title: "Build a \"subway or bus?\" app during a transit outage · Lenexa Learn"
description: "During a San Francisco subway outage, one user had Claude Code write a script to download the public real-time subway diagrams and build an image labeling…"
url: https://www.lenexa.ai/learn/agents/build-a-subway-or-bus-app-during-a-transit-outage/
site: "Lenexa Learn"
---

Claude Code

# Build a "subway or bus?" app during a transit outage

During a San Francisco subway outage, one user had Claude Code write a script to download the public real-time subway diagrams and build an image labeling tool, as first steps toward a web app.

**Caution.** Some tools needed manual tweaking.

## Steps

1. Find public data.
2. Have it write a downloader.
3. Build the tools one step at a time.

## Prompt you can copy

```
Write a script that saves the public transit status image every minute.
```

## What you get

A working data pipeline for the app.

## Source

[hn](https://news.ycombinator.com/item?id=46637283) · January 2026

For Individuals. [Claude Code](https://www.lenexa.ai/learn/agents/tool/claude-code/). Added October 12, 2026. Shared by @MrEricSir.

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