Mointeach na hInse Lia is a typical Bord na Mona narrow gauge railway that serves a working peat bog in County Offaly in the Irish Republic. The railway is 2 foot 6 inch gauge rather than the normal 3 foot gauge (some peat railways in County Donegal were 2 foot gauge).

One side of the layout shows the bog in its natural state, whilst the other shows the peat being harvested and the various machines, home-produced, that do this. The peat is cut, goes for domestic use, then rolled and conveyed to the local power station.

The period is the early 1970's and most of the locomotives are diesel powered, mainly of British manufacture, with some steam engines. Freight wagons are specially designed for the peat traffic.

The ruin at the rear of the layout is the remains of St Brendons monestery, which, one day, will become a tourist attraction.