# Switch Inspection Diagram (wissel_GW)

## Source

`06_Figuren_plaatjes/PDF/Plaatje wissel_GW.pdf`

A reference diagram used by the Duimstok inspection app to guide the user through photographing a railway switch (Dutch: *wissel*). The `GW` suffix refers to the switch type.

## Purpose

The diagram acts as an **interactive photo-capture template**. During an inspection, the user is expected to supply a photograph for each labeled camera position. The blue underlined labels in the PDF are hyperlinks — in the app they map to photo-upload slots.

## Layout

Top-down schematic of a single switch, split lengthwise into three color-coded zones:

| Zone | Color | Dutch label | Description |
|------|-------|-------------|-------------|
| 1 | Green | Puntstukgedeelte | Frog / crossing section — where the two rails converge |
| 2 | Turquoise | Middengedeelte | Middle section — closure rails between frog and points |
| 3 | Red | Tongbeweging | Switch-blade / point-motor section — contains the actuator mechanism |

## Camera positions

Eight eye/camera icons surround the switch, each tied to a photo slot:

- **Longitudinal (4×)** — "Overzichtsfoto" (overview photo) at the top-left, top-right, bottom-left, and bottom-right, taken along the track direction.
- **Transverse (6×)** — "Foto" (detail photo) on the left and right of each of the three zones, taken perpendicular to the track.

Total: **10 photo slots per switch inspection** (4 overviews + 6 details).

## Usage in the app

- Render the diagram as the visual index on the switch-inspection screen.
- Each hyperlink label corresponds to a photo slot in the inspection record.
- Slot identifiers should encode both **position** (top/bottom/left/right) and **zone** (frog/middle/blade) so the stored photos can be reassembled into the correct diagram positions in the report.

## Notes

- The diagram is language-dependent (Dutch labels). Any translation must preserve the zone semantics, not just the words.
- The actuator (two cylindrical elements at the bottom of the red zone) is drawn in place — detail photos of the *Tongbeweging* zone should capture this mechanism.