in the pack of tos season 3 the last DVD contain the episode the cage, the original and the restored version, in the original you see gene walking on a set and you see what look like a work station for the enginery and a warpcore like on the enterprise A, but the warpcore seem old like it was from early tos era, but the enterprise was equiped with a intermix chamber, so is this warpcore was use on a set or is it just a prototype?