How many "Steam Along" Thomas variations?

Are you sure it is factory?
Could it be the white deck from the nonmetallic version, with the metallic Thomas upper half and shell?
Yes there is another slight variation that exists though...
Seems like at the time of the Tomy to HitToys transition some of them were released without red boiler stripes.

It was actually ME who swapped the body shells (I did that for customizing )