The Great Western Railway was the principal competitor of the LNWR in the area, and the GWR had taken steps to reach Rhyl, an important regional centre.
The GWR attempted to take control of the Denbigh, Ruthin & Corwen Railway as well as the Vale of Clwyd line.
The northern leg of the triangle was abandoned and only partly constructed with a few hundred metres visible at the east end.
Despite the financial situation, in 1867 the M&DJR obtained a further Act of Parliament for running powers over part of the Wrexham, Mold and Connah's Quay Railway, and also (belatedly) to Denbigh.
[3] The line opened on 12 September 1869 and was worked by the LNWR, although the Mold and Denbigh Junction Railway company remained independent.
[7] Passenger trains on the line were withdrawn on 30 April 1962, but goods and parcels traffic to Mold from Chester continued.
[8] The track from Dolfechlas Crossing to the junction with the Vale of Clwyd line just north of Denbigh was lifted in 1963.
However, limestone powder traffic continued to originate at Ruby Limeworks [9] and goods trains also served the Synthite chemical works (a factory producing formaldehyde) just north of Mold.
When the Synthite works transferred from rail to road haulage on 15/3/1983 the railway activity in the area ceased completely.