Star Trek Discontinunity - The TOS Engine room

In Star Trek The Original Series, the positioning of the warp core is some what ambiguous. In the First Season episode The Alternative Factor, Engineering is depicted as a small room. However in later episodes, Main Engineering is a cavernous room. This is easily explainable. The Alternative Factor engineering could have merely been a room situated under the dilithium crystal apparatus in the center of the larger engineering that provided another access point for the dilithium crystals. There is also another problem with the engineering sets on TOS Enterprise. In the larger engineering set the dilithium crystal chamber is apparently located on the floor in the middle of the room, leading us to believe that the actual warp core runs horizontally under main Engineering, However there is a large apparatus in the far wall that is obviously supposed to be the warp core. Once again there is a relatively simple explanation for this. The warp core actually did run horizontally under main engineering. The large apparatus inset into the far wall is not the warp core but a mess of power transfer conduits. It is sometimes seen pulsating because the warp core is located directly below these conduits, and its pulsating can still be seen coming up the from the deck below. In the first Star Trek movie the Enterprise had a vertical warp core. This simply means that the Enterprise was refitted with a new type of core.