Wagons tend to be relegated to being useful services vehicles.
The narrow gauge used very diverse wagons; the railways tend to be specialised by industry, and each industry became very adept at designing vehicles which were the most efficient means of acheiving the specific transport objective.
At the MRT, we have amassed a goodly collection of wagons, and hopefully we will be able to represent at least a selection from each of the main industries which used industrial narrow gauge railways.