The exercise keeps loading

Follow
Tip:
We recommend using Google Chrome or Mozilla Firefox as your webbrowser while using TrainTool. These browsers do not need Flash Player because they make use of HTML5.

 

If you see this screen in Safari, Flash is probably disabled for TrainTool:

 

To solve this issue, follow the these steps: 

Step 1:

Go to Preferences

 

Step 2:

Open the Plug-in settings:

 

Step 3:

Enable Flash for TrainTool:

 

 

 Stap 4:

Reload the TrainTool page.