I have working in a not dissimilar industry and had the following setup;

TrainTestSuite (this might be per supplier/operator)

-testcase->SingleBooking

-testcase->ReturnBooking

Both would utilize the same endpoint as the Test Suite

Within each test case I would have the following;

• OutboundDataSource (containing from and to locations)
• PropertyTransfer (Transfer values to JsonSingleRQ using xpath)
• JsonSingleRQ (your JSON request)
• DatasourceLoop (back to the start)

Duplicate this for your return journeys (obviously with additional values in the data source). I would suggest to treat them as indipendant values rather than transferring to opposing targets on the return.

I have working in a not dissimilar industry and had the following setup;

TrainTestSuite (this might be per supplier/operator)

-testcase->SingleBooking

-testcase->ReturnBooking

Both would utilize the same endpoint as the Test Suite

Within each test case I would have the following;

• Properties (containing from and to locations)
• PropertyTransfer (Transfer values to JsonSingleRQ using xpath)
• JsonSingleRQ (your JSON request)

Duplicate this for your return journeys (obviously with additional values in the properties). I would suggest to treat them as independent values rather than transferring to opposing targets on the return.