MECHANICS
In order to attach two sections of a large, enclosed area, it is often best to used flanges and bolts. An instance of this is the assembly between the locomotive and the transmission in an automobile. In this case, both the engine and the transmission contain a amount of moving parts that can easily get injured if they get dust or other small objects inside of them. By linking the outer casings of the engine and program in this way, engineers protect the inner workings of both.