To be able to successfully work in the field of Railway Mechanical Engineering you should learn several things. First the wheels on rail movement and the guidance principles. Then we need to know different components of moving resistance. The power needed for train movement and resistance overcoming make difference in types of locomotives which are moving power transforming plants. Diesel-engine or electric power from the catenary needs to be transformed into mechanical energy. Pure mechanical gears can do this for low power locomotives only. In most other cases, electric or hydrodynamic gear is needed. But there are lot of variations and each of them needs appropriate control system. Unfortunately technical systems are not ideal, and some energy dissipation is always present. Cooling system of the locomotive has the task to bring out excessive heat generated by this cause. For the train, we need auxiliary power sources, like compressed air for the brake system and other devices. Compressor system on the locomotive should master that. And when we put the train in the movement, the dynamical forces and accelerations arise. What are the possible consequences, what are the acceptable limits, and what an engineer can do to keep all dynamical phenomena in acceptable limits, should be learned, too.
Another problem with the train in motion is how to stop the moving mass of several thousands ton? The brake system must be reliable, well coordinated within maybe hundred of vehicles in train, and safely controlled from the locomotive. We make the vehicles for people transportation and for freight traffic. They must be put in appropriate, strong enough structure. We need to learn how to design, calculate and afterwards to test the strength of structure. Something forgotten? Of course, we need to know how to maintain and repair these vehicles and… Lot of interesting things! Isn’t it?