* Newtown and Machynlleth Railway between Moat Lane Junction and Machynlleth
* Aberystwith and Welsh Coast Railway between Machynlleth and Aberystwyth/Pwllheli.

These lines were constructed between 1855 and 1869. The section west of Buttington Junction became part of the Cambrian Railways in 1864.

The Cambrian Railways became part of the Great Western Railway