The phrase "a network of railways" is correct and usable in written English.
It can be used when discussing the interconnected system of train tracks and services that facilitate transportation by rail.
Example: "The country has invested heavily in developing a network of railways to improve public transportation and reduce traffic congestion."
Alternatives: "a system of railways" or "an array of railways".
The forest, which concealed a network of railway tracks and heavy artillery installations, was cleared for the train of the allied forces commander, Marshal Foch, and a train for the German deputation.
The concrete proved successful, and Gair eventually built a network of at least 10 structures or additions, including a stable, a powerhouse and a pier, all connected by a network of railway lines, underground tunnels and, at a later point, aerial bridges.
The modern-day version envisages a network of ports, railways, tunnels and other infrastructure spanning 60 countries.
In contrast to the Franco-Prussian war of 1870, however, the French commander, Joseph Joffre, kept his nerve and redeployed his forces via a network of strategic railways.
Subsequently, a network of small railways were used to facilitate this task.
The C&SLR thus encouraged the construction of a network of underground railways in London, far larger than might have been the case otherwise.
Together with the Maritime Silk Road in what Beijing calls the "One Belt One Road" project, this comprises a network of roads, railways, ports and pipeline that China expects will link it to the Middle East and Europe via Central, Southeast and South Asia.
Officials envisaged that the eight northeast states -- Assam, Meghalaya, Manipur, Nagaland, Sikkim, Arunachal Pradesh, Tripura and Mizoram -- would emerge as a trading hub for two dynamic regions connected by a network of highways, railways, pipelines and transmission lines.
A network of light railway lines connects the Fayyūm area and the delta villages with the main lines.
The CPEC project -- a network of roads, railway and pipelines -- moved up from blueprints in April when Chinese President Xi Jinping and his senior officials signed 51 agreements with Pakistan, 31 related to CPEC to which China has committed an investment of $46 billion.
