Leaving aside the slightly bizarre mix of Welsh/English locations, this Railway Clearing House map from 1903 shows much.

For example:

The joint line between Nantybwch and Rhymney gave the LNWR a route to Cardiff and the Rhymney a route to the Midlands/North of England via Abergavenny.

The Brecon and Merthyr railway to the south of Rhymney was actually converted from the old Rumney Tramroad which dated back to 1826!

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