I would personally think that you all are forgetting Duke the lost engine. because that is the very first narrow Gauge engine. also was the very starting point when Rev wrote the Narrow Gauge stories. at that time he was a volunteer with the Festiniog Railway in Porthmadog.
The coaches from the narrow gauge line that have been preserved from when they used the models both have faces and no faces. so doing a sort of mix is totally possible. but from Bachmanns stand point it would be easier to only have 1 kind to save on starting molds.
as for Freight cars you do also see some small vans and gondolas when Rusty is out repairing the track. so there is more freight cars around you just have to look for them.
The coaches from the narrow gauge line that have been preserved from when they used the models both have faces and no faces. so doing a sort of mix is totally possible. but from Bachmanns stand point it would be easier to only have 1 kind to save on starting molds.
as for Freight cars you do also see some small vans and gondolas when Rusty is out repairing the track. so there is more freight cars around you just have to look for them.