Make your first mod

Change the price of a sample locomotive and see it in the Fourways shop. All you need is the game and a plain-text editor.

Download and unpack

Download sample ZIP

Unzip the download. It contains a first_locomotive folder with two files inside. mod.json identifies the mod and data.json defines the locomotive.
Change the price

Open data.json in a plain-text editor. Find this line under workshop_night_mail.
```
"cost": 88000,
```
Change 88000 to 45000. Keep the trailing comma and save the file as data.json.
Enable the mod

From the title screen, choose Mods → Open the mods folder. Move the unpacked first_locomotive folder there. Back in Fourways, click Look again and tick My first locomotive.
Check the shop

Start a new game in 1970. Press B or click Vehicle in the toolbar, then select Trains. The Owl Workshop Mail card should show $45,000. You can check the card before building any track or adding wagons.

If the locomotive is missing

Check that mod.json and data.json are directly inside the folder you moved into the mods folder.
If the Mods screen shows an error, check that you only changed the number in data.json. Save it, then click Look again.
The locomotive goes on sale in 1962. Check that your game is in 1962 or later.