During "Campania's" first trips across the Atlantic, hull vibration was noted to be a problem and sea-spray had been a nuisance to passengers in heavy seas. This led to design modifications being made to "Lucania", which was still under construction. The modifications to "Lucania" proved to be successful, so Cunard decided to make similar modifications to "Campania". "Campania" was returned to the builder's yard and her aft section was strengthened to reduce the vibration. Also, her promenade deck was extended over the forward and aft well-decks. The sides of the well-decks were fully enclosed by plating which extended some way along the lower promenade. While the aft well deck was left open from above, the forward well deck and gangway over it were dispensed with completely. The new forward design would be echoed 14 years later in the design of the "Lusitania" and "Mauretania".