EM4 Electric Trainsets (Cyrillic ЭМ4, known as "Sputnik") were produced from 2003 to 2006 by the JSC "Spetsremont" factory. Their cars have a common interior space. Each car has three pairs of sliding doors propped-designed only for the high platforms. EM4 "Sputniks” have operated on the following rapid suburban routes:• Moscow - Mytischi – Pushkino, • Moscow - Mytischi - Bolshevo • Moscow - Lyubertsy 1 – Ramenskoye