You'll need to add a summary field that computes the total of your Total KM field. Then sort your records by Journey Type to group them. In your data source options (the details look a bit different for FileMaker 12 when compared to version 11), specify "found set" and "Summarized data when sorted".
Thank you very much Phil,
It was very close to this on FMP12 - I did have to swap axis using the bar chart to get it using the calcultions correct but that sorted it all out!
Thanks very much Phil