How to generate infrastructure from OSM

Describe the steps to generate an infrastructure from OSM data

On geofabrik, download the .osm.pbf file corresponding to the area you want. Here we take Germany as an example.
This is not mandatory, but using osmium is strongly recommended to filter the .osm.pbf file with only the railway-related data needed by osm_to_railjson. The tag railway is used on nodes, ways and relations, and the tag public_transport=stop_area is used on relations. This can divide by 3 the time taken by the osm_to_railjson generation.
```
osmium tags-filter <path/to/germany.osm.pbf> nwr/railway r/public_transport=stop_area -o <path/to/germany.osm.pbf>
```
Launch conversion (release build of editoast and conversion can be long):
```
cd ../../editoast
cargo run --release -p osm_to_railjson -- <path/to/germany.osm.pbf> <path/to/germany_railjson.json>
```
Depending on the area, signals data can be missing. If so, the --generate-signals option overrides the potential existing signals with automatically generated realistics ones.

Load the generated railjson, either using load-railjson-script.sh or OSRD’s web interface:

cargo run --release -- infra import-railjson --generate "Germany_OSM" <path/to/germany_railjson.json>