Does anyone know what "cubi series" is or why it was built. This document has a little information, but can someone tell me why it was built?

Read the excerpt from hemingway’s a farewell to arms. we parked the cars beyond the brickyard. the ovens and some deep holes had been equipped as dressing stations. there were three doctors that i knew. i talked with the major and learned that when it should start and our cars should be loaded we would drive them back along the screened road and up to the main road along the ridge where there would be a post and other cars to clear them. which best describes hemingway’s style of writing in the excerpt? straightforward and simple, while still relating a lot of information to the reader long-winded and offering far too much information to the reader overly complicated, making it difficult to interpret and understand the text effortless and uncomplicated, with little meaning for the reader to interpret