The M&MR's original plan was to build a line through the mountains, one scheme involving a six-mile tunnel, to Llangurig whence it would proceed to Llanidloes, reaching Manchester over other companies' lines through Moat Lane, Newtown, Welshpool, Oswestry, Whitchurch and Crewe, however finance was not forthcoming and the prospect of such a route never being economic became apparent: only the section from Llangurig to Llanidloes was actually built. A line towards Aberystwyth via Llanilar was opened instead in 1867; from Aberystwyth access to Moat Lane and onwards could be achieved, after a reversal, by way of Machynlleth and Caersws.