In the context of infrastructure, open access involves physical infrastructure such as railways and physical telecommunications network plant being made available to clients other than the owners, for a fee.
For example, private railways within, say, a steel works are private and not available to outsiders. In the hypothetical case of the steelworks having a port or a railway to a distant mine, outsiders might want access to save having to incur a possibly large cost of building their own facility.
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