Thomas Savin was a British railway engineer who was the contractor who built many railways in Wales and the Welsh borders from 1857 to 1866. He also in some cases was an investor in such schemes.

Railway contractor

In 1857 Savin formed a partnership with David Davies to build the Vale of Clwyd Railway. The partnership was the principle contractor for many of the lines that became the Cambrian Railways

Cambrian Railways

Cambrian Railways owned of track over a large area of mid-Wales. The system was an amalgamation of a number of railways that were incorporated in 1864, 1865 and 1904...

. The partnership was dissolved in 1860.(http://www.london-gazette.co.uk/issues/22525/pages/2751) He also had an interest in or worked on a number of minor railways, including the Corris Railway

Corris Railway

The Corris Railway is a narrow gauge preserved railway based in Corris on the border between Merionethshire and Montgomeryshire in Mid-Wales....

, the The Kington & Eardisley Railway and the Bishop's Castle Railway

Savin's bankruptcy in 1866 led to the stalling of the Aberystwyth & Welsh Coast Railway which became a part of the Cambrian Railways.