Trying to account for the colours of the Goods Wagons is virtually impossible due to the fact that many shades of the main colours exist, here is an attempt to give the main variations.
w1-3 Three main colours of the open wagons, also known in Green.
p1-2 Two colours on the "Passenger" Goods Wagons, also in w2.
m1-3 Three colours of the Mineral Wagon.
g1-3 Three of the shades on the Goods Van, also known in w2 Brown.
w1-2 Two main roof colours, also the two colours of most of the Station Items. Also known in g3 Grey.