Someone on a website (Deepwoods) was asking about how the minis will sit properly on the railroad tracks (mining cart tracks in this case). First off, on the scenic base see here scenic base there will not be 12 orcs on this base. There will be a tipped over mining cart, some jewels, maybe a gobbo, and possibly one black orc. The base will represent 12 orcs however.
Anyway, here is an example of a how the unit champion of the unit will be placed on the rail.