The decision to convert the F&BR to standard gauge had been taken in March 1882 and work began on converting the F&BR's narrow gauge line to Blaenau to standard gauge in May. The standard gauge Bala and Festiniog Railway opened from to Llan Ffestiniog on 1 November 1882. During conversion a third rail was provided to enable the narrow gauge trains to continue operation until conversion was complete. Narrow gauge operation ceased on 5 September 1883. In some cases the third rail was removed and in others it was moved along sleepers to serve as check rails on curves. The formal standard gauge opening was on 10 September 1883, at which time the physical Festiniog and Blaenau Railway ceased to exist.