Er (Эр762-91) last series of the E engines
Э(E)- series of steam engine were designed by Russian engineer Łopuszyński, Wacław Marian in 1909 and firstly produced in the Russian Empire. In 1920 in the first years after the Socialist Revolution of 1917 and Civil war young Soviet Russia ordered engines of simplified project of 1917 y in Sweden and Germany with total 500 of the Esh and 700 of Er-series built consequently. Steam engines of the Em (Эм) seria evolved as further development of Eu-type (Эу), that was the very first E-type engine produced in Soviet Russia in 1926—1930 in quantity of 2500 ones after the orders of the Esh and Er-types in Sweden and Germany, consequently. Engines of Eu (Эу) seria were the first E-model built in Soviet Russia. About 2500 ones were produced in 1926—1930. Unfortunately, the coupling weight of the Eu locomotive increased by 5 tons. In order to improve performance in the next model, the steam pressure in the boiler was raised from 12 to 14 kgf/cm2. Other design changes were made concerning the water feeding scheme. Welded joints were used for the first time. All this resulted in a reduction of the total weight by three tons and lower load on the rails. Steam locomotives of Em series were built from 1932 to 1935. A total of 2325 units were built. Since the Em model had a significant reduction in the load on the 4 and 5 wheelset, which was rather a negative result, the next modernization made it possible to improve the performance and at the same time compensate for the weight problem by increasing the volume of the firebox. Thus, in Эр (Er) model the firebox grew in length by 540 mm, which required the frame to be lengthened by 45 cm. Accordingly, the grate area increased (to 5.09 m2 vs. 4.46 m2) and the heating surface increased to 200 m2. All this resulted in a 10-15% increase in power output and efficiency compared to the previous Eu and Em models.
After WW2 big series of the last project Er (model of 1944 y) were produced in Hungary, Romania, Poland. Total production of the E-type exceeds 10853 ones that is absolute record for the locomotives.
Er (Эр762-91) last series of the E engines
Э(E)- series of steam engine were designed by Russian engineer Łopuszyński, Wacław Marian in 1909 and firstly produced in the Russian Empire. In 1920 in the first years after the Socialist Revolution of 1917 and Civil war young Soviet Russia ordered engines of simplified project of 1917 y in Sweden and Germany with total 500 of the Esh and 700 of Er-series built consequently. Steam engines of the Em (Эм) seria evolved as further development of Eu-type (Эу), that was the very first E-type engine produced in Soviet Russia in 1926—1930 in quantity of 2500 ones after the orders of the Esh and Er-types in Sweden and Germany, consequently. Engines of Eu (Эу) seria were the first E-model built in Soviet Russia. About 2500 ones were produced in 1926—1930. Unfortunately, the coupling weight of the Eu locomotive increased by 5 tons. In order to improve performance in the next model, the steam pressure in the boiler was raised from 12 to 14 kgf/cm2. Other design changes were made concerning the water feeding scheme. Welded joints were used for the first time. All this resulted in a reduction of the total weight by three tons and lower load on the rails. Steam locomotives of Em series were built from 1932 to 1935. A total of 2325 units were built. Since the Em model had a significant reduction in the load on the 4 and 5 wheelset, which was rather a negative result, the next modernization made it possible to improve the performance and at the same time compensate for the weight problem by increasing the volume of the firebox. Thus, in Эр (Er) model the firebox grew in length by 540 mm, which required the frame to be lengthened by 45 cm. Accordingly, the grate area increased (to 5.09 m2 vs. 4.46 m2) and the heating surface increased to 200 m2. All this resulted in a 10-15% increase in power output and efficiency compared to the previous Eu and Em models.
After WW2 big series of the last project Er (model of 1944 y) were produced in Hungary, Romania, Poland. Total production of the E-type exceeds 10853 ones that is absolute record for the locomotives.