The 15th century parish church located in the village is dedicated to Saint Curig, its reputed founder, and is a grade II* listed building.

The line was to head west from Llanidloes by way of Llangurig to Pant Mawr, through a tunnel, turning southwards for Ysbyty Ystwyth and Tregaron, finally connecting with the Carmarthen & Cardigan Railway at Pencader.

The Llangurig branch was fully built, and a single goods train ran along its length, at which point the L&NR invoiced the M&MR for the cost of the joint station at Llanidloes.

By 1864 the M&MR had changed its plans for crossing the Pumlumon range, and hence stopped all work west of Llangurig.

1866 was a difficult year, including the collapse of the London Bank Overend, Gurney and Company, causing many industrial projects to encounter financial hardship.

In 1882 the M&MHR started to dismantle the Llangurig branch, lifting 1.5 miles (2.4 km) of the essentially unused track for maintenance purposes elsewhere.

A large part of the route east of Llangurig is marked on current OS maps as 'dismantled railway', much of the course close to the A470 road through Nant Gwynwydd being clearly visible.