Although the design called for the construction of only a single track of a standard gauge of 4 feet 8½ inches, an important decision made was to ensure that as far as possible the right-of-way of the railway, i.e. all bridges, cuttings, and embankments (with the exception of the tunnels to reduce budget), allowed for the laying of a future second track. This decision, although it might have seemed unnecessarily costly at the time, proved of benefit some 75 years later when the railway was finally double-tracked.