 The train was economical in fuel use, and did not require a fireman, but train passengers and crew complained at the very rough ride - rattling windows a particular complaint.As part of British Rail's Modernisation Plan, Derby Lightweight DMUs were introduced three years later.A 1956 brochure advertised day return tickets from Bangor to Amlwch for 4s.4d, or Llangefni for 11d.