Definition of "Glamorganshire"

Trevithick's first use of steam traction on rail took place at Merthyr Tydfil, Glamorganshire, on a tramroad 9¾ miles long between the Penydarren ironworks of Samuel Homfray, and the staithes at Abercynon, where the worked iron was loaded into barges on the Glamorganshire Canal.

1951 March, E. W. Twining, “The First Railway Locomotive”, in Railway Magazine, page 197