The true form of Thomas the Tank Engine

Exhibit A: (above) Joel Carroll (@joelcarroll) hypothesizes a many-legged parasite that replaces the internal mechanics in the manner of Cymothia Exigua, the tongue-replacing fish louse. Buy the T-shirt.

Exhibit B: (below) Yui Abe hypothesizes a giant man literally confined within the chassis of the engine (via); the tees are sold out; presumably a collector's item.