JimG
Western Thunderer
We can be certain the van in the photo wasn't the CR van built in 1906 as the photo dates from the 1880s.
It might still be a Caledonian or North British van. The Caledonian Diag 1 meat van was produced in 1888 and had smooth, vertical panelled sides with a higher, peaked arc roof. Looking closely at the van in the picture, you can almost see the vertical panelling when trying to rule out wishful thinking.

Jim.