How many color variants of this small Wamu boxcar are there?

[Super]

(an event only release).

Really? I didn't know these stubby Box Cars were Event Exclusives or do you mean that just this color variant (black with yellow wheels) was exclusive. Somehow card in the picture seems like its not a fit but maybe it explains it in the description and I wonder what Event it was from as I haven't seen any Plarail Expo video's that showed an exclusive on a card. The seller does state its unopened but the packaging looks strange to me.