ER9 electric trainset

For servicing suburban commuter lines, electrified on 25 kV, AC, the Railcar Manufacturing Plant of Riga produced ER9, then ER9p electric trainsets in the 1966-1975 period. The mass production of these trains had begun in 1964.

Railcar types

Three types of cars were manufactured for these trains, which were motor, trailer, and cab-trailer. The minimal quantity of cars is four (2 motor & 2 cab-trailer cars). The maximal quantity was twelve (6 motor cars, 4 trailers, and 2 cab-trailers.) The trains could be controlled and/or operated only from cab cars.

Design and construction

Railcar bodies

The railcar bodies utilise a frameless construction similar to the ER2 series trainsets, with a number of modifications due to the different equipment arrangement, such as AC transformers and rectifiers. The car entrances are fitted for both high and low platforms. Like most Soviet rollingstock, the cars have SA-3 automatic couplers.

The bodies are supported by two twin-axle bogies. The bogie frames are of a H-shaped fully welded construction. Trainsets constructed up to ER9p-125 have N. E. Galakhov's elliptical amortizers in their central suspensions. Bogie frames are supported by 8 cylindrical springs installed in a coat of axle box balancers. The static deformation of amortizer is 105 mm. Starting with ER9p-126 trainset (1966), the trolleys are supported on axles box through four sets of cylindrical springs, placed in two rows. The hydraulic amortizers are placed in...
Read More