EMU's

     DEMU-Diesel Electric Multiple Unit

         In a diesel -electric multiple unit a diesel engine drives an electrical generator or an alternator which produces electrical energy.The generated current is fed to the traction motors on the wheels.This falls into the category of DMU(Diesel Multiple Units).Because of its high acceleration it is used for local runs i.e when the stations are closer.There are many countries which uses DMU services.Diesel Multiple Units are classified according to their transmission type: Diesel-Electric(DEMU),Diesel-Mechanical(DMMU),Diesel-Hydraulic(DHMU).A train composed of DMU cars scales well, as it allows extra passenger capacity to be added at the same time as motive power.It also permits passenger capacity to be matched for demand and for trains to be joined and split en route.Distribution of the propulsion among the cars also result in a system that is less vulnerable to single point of failure outages.Many classes of DMU are capable of operating with faulty units still in the consist.Because of the self contained nature of diesel engines there is no need to run overhead electric lines which can result in lower system construction costs.

MEMU-Mainline Electric Multiple Unit.

                             MEMU is a commuter rail system in India operated by Indian Railways for semi urban and rural areas. MEMU operates on AC drawn from overhead cables. MEMU falls in the category of EMU trains which  has fast acceleration and  pollution free operation. M8 is an EMU railroad car used in Port Chester,New York. SWT class 444 and class 450 are another EMU units in London Waterloo bound service. Z-20500 is a type of EMU used in France. EMU services are working presently in Mumbai,Delhi,Kolkata,Chennai,Hyderabad etc.This configuration of the train is not popular only among commutators but also as a feeder train to main trains.These services are very popular among daily commutators for In-time services,Reliability in services with very rare failure,Very low fare,Vendor compartments for carrying daily market products. EMU improves the safety,it improves the sectional capacity.