The engine. The driver is called the engineer.
If it's a powered locomotive, then a locomotive. If it's a car with a cab to control the train, then a cab-car. If it's a train powered by itself, called a Multiple Unit (MU) with the engine part of the train, the front is called, well, the head end.
The front part of the throat is called the "pharynx".
Hub and bearing assembly?
The front part of a hat is the brim.
Each part of a train is called a car.
Front part of a Baseball is called "peak", i.e. the stiff front part of a cap that sticks out above you eyes.
The front part of a ship is called the bow.
The front part of a pencil is called the tip or the point. This is the part that is used for writing or drawing on paper.
An engine heads a trains, with cars behind it, and the caboose the last car. NOTE: If a train is heavy with freight, it may have several engine 'cars' pulling it, AND even pushing it from the back. NOTE: There are several types of train "cars".
The fairing.
Usually The front part of the stage is called the downstage! I think the questions refers to the part of a stage in front of the curtain.. referred to as the "apron". Hope this helps
A locomotive is what supplies the power. A locomotive can in itself be considered a train depending on its function. A cowcatcher!