10052 Intelligent Locomotive is a DUPLO TrainsExplore Logic set released in 2003. The set includes a train engine, two DUPLO figures, and three coloured pieces with stickers on either end.
The set consists, mainly, of the engine section of a train. It is primarily yellow, and has a transparent windscreen that can be opened up to place a DUPLO Figure in a chair inside it. The yellow back section (presumably) contains batteries. When buttons located on the upper section of the train are pushed, it will make various noises. It has a black undercarriage, and grey wheels.
The set also includes three parts, one transparent pink, one trans light blue, and one trans red, that can be inserted into the train, to change the noises it makes.