WHR RAN EWS Rannoch Estate Worker's Cottage
A bit of an assumption here: the final building close to the railway at Rannoch apears for the first time on large scale historical maps at around the same time as the railway, but its position on the old drovers' road between Glen Coe and Rannoch and comparison of its architectural features - quoins for the walls, doors and windows - with the WHR-built worker's cottages, not to mention its greater floor area (although it's still tiny) suggest that it was built by a third party, almost certainly the large estate which owns the land, along with other cottages further along the drove road.
Asset created with reference to photos taken during a site visit in October 2018