What is the Difference between Data Transformation vs Transportation? Is there a difference in meaning between "data transformation" and "data transportation" in ETL process and data warehousing? or both concepts can be used interchangeably in this context?

Thanks
Transportation is just moving data from one place to another - in ETL, from source system to either staging area, data warehouse or data mart. 

Transformation is changing data structure so that it meets data warehouse needs - i.e. star schema, denormalization, aggregation, calculations, data cleansing, data enrichment etc. 

Both happen while ETL, but the "T" from "ETL" stands for Transformation.