The Corris Railway had several unusual features:
The 2 ft 3 in (686 mm) gauge is rare, shared by only three other public lines in the UK: the nearby Talyllyn Railway and Plynlimon and Hafan Tramway and the Campbeltown and Machrihanish Light Railway in Scotland.

Its origins as a horse tramroad and ascent through the narrow and winding Dulas valley meant it had exceptionally tight curves.
Its original passenger carriages were simple 4-wheelers derived from urban horse-drawn tramway designs with end balconies; they rode poorly and were quickly rebuilt into longer bogie carriages by placing two of the original bodies end-to-end on a longer underframe.

The stations were exceptionally narrow, again because of the geography of the line, and all were on the east side of the rails, so the carriages and locomotives had doors on that side only, as on the Talyllyn Railway.

The vertical trestle waggons for carrying large slabs of slate from the quarries were also rarely found on other railways, notable exceptions being the Ffestiniog Railway and the nearby Hendre-Ddu Tramway.

Corris Station and the original Machynlleth Station had overall roofs, features which were rare on a British narrow gauge railway.
At Corris, the roof was over the main running line and trains for Aberllefenni passed under it; at Machynlleth the rear of the train rested under the station roof while the front was in the open air.
The original Machynlleth station was demolished and replaced in 1905 with the building that still stands alongside the A487 trunk road north of the main-line railway overbridge.
The track bed continued under the main-line railway overbridge alongside Heol Y Doll, through its own short tunnel that is closed with stone blocks.
Beyond the overbridge, a Texaco petrol station is sited on the former route.
The Corris Railway had several unusual features:
The 2 ft 3 in (686 mm) gauge is rare, shared by only three other public lines in the UK: the nearby Talyllyn Railway and Plynlimon and Hafan Tramway and the Campbeltown and Machrihanish Light Railway in Scotland.
Its origins as a horse tramroad and ascent through the narrow and winding Dulas valley meant it had exceptionally tight curves. Its original passenger carriages were simple 4-wheelers derived from urban horse-drawn tramway designs with end balconies; they rode poorly and were quickly rebuilt into longer bogie carriages by placing two of the original bodies end-to-end on a longer underframe.
The stations were exceptionally narrow, again because of the geography of the line, and all were on the east side of the rails, so the carriages and locomotives had doors on that side only, as on the Talyllyn Railway.
The vertical trestle waggons for carrying large slabs of slate from the quarries were also rarely found on other railways, notable exceptions being the Ffestiniog Railway and the nearby Hendre-Ddu Tramway.
Corris Station and the original Machynlleth Station had overall roofs, features which were rare on a British narrow gauge railway. At Corris, the roof was over the main running line and trains for Aberllefenni passed under it; at Machynlleth the rear of the train rested under the station roof while the front was in the open air. The original Machynlleth station was demolished and replaced in 1905 with the building that still stands alongside the A487 trunk road north of the main-line railway overbridge. The track bed continued under the main-line railway overbridge alongside Heol Y Doll, through its own short tunnel that is closed with stone blocks. Beyond the overbridge, a Texaco petrol station is sited on the former route.
Corris Railway