The main difference between traditional style trains most commonly used today and maglev ones is that the latter has no wheels. These locomotives levitate. The tracks they run on are magnetized. The trains use the force this creates to propel them upward and forward at high speeds. Running these engines require the consumption of only a small amount of fuel.
Thus, in addition to being faster than traditional style locomotives, these ones are more eco-friendly and less costly to operate. One challenge associated with instituting maglev trains is that there is a large start-up cost. Nevertheless, Maglev trains are already in operation in places like Germany and China, perhaps becoming the norm of rail travel by 2030.