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.
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.
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".
A locomotive is what supplies the power. A locomotive can in itself be considered a train depending on its function. A cowcatcher!
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
Both are called addend
The " front "or forward part of a ship is called the bow the "back" or aft part of a ship is called the sternThe front of a ship is called the 'bow' or the 'prow'. The back of a ship is called the 'stern'.