BDŽ class 77

The locomotives were built and delivered by the Romanian plant "23 August" (now FAUR) - Bucharest under technical conditions of BDZ. Maximum interchangeability of aggregates, assemblies and parts with the class 76 machines, built in the same plant, was pursued. The main differences with them are:

  • altered gear ratio, reducing the maximum speed in favor of traction;
  • the number of engine cooling radiators has been increased;
  • the way the engine is coupled with the hydro compound is changed;
  • many parameters of the engine have been improved (driving mode, increased power output, etc.);
  • more cabin controls, control devices, and more.
BDŽ class 77
Type and origin
Power typeDiesel-hydraulic
BuilderFAUR – Bucharest
Build date1988
Total produced10
Specifications
Configuration:
​
 • UICB'B'
Gauge760 mm (2 ft 5 15⁄16 in) Bosnian gauge
Wheel diameter1,000 mm (3 ft 3 3⁄8 in)
Length:
​
 • Over couplers13,330 mm (43 ft 9 in)
Width2,470 mm (8 ft 1 in)
Height3,520 mm (11 ft 7 in)
Axle load13.25 t (13.04 long tons; 14.61 short tons)
Loco weighttotal: 52 t (51 long tons; 57.5 short tons),
empty: 48.5 t (47.5 long tons; 53.5 short tons)
TransmissionHydraulic
Performance figures
Maximum speed60 km/h (37 mph)
Power outputEngines: 1,100 hp (820 kW)
Career
OperatorsBDŽ
Numbers77 001 - 77 010
Disposition4 preserved, 5 sold to Argentina, 1 scrapped

All class 77 locomotives are assigned to the Septemvri depot. This fully satisfied the needs for narrow-track locomotives at the then volume of traffic. Since the beginning of the 1990s there has been a drastic decline in transport. Then almost half of the locomotive fleet remained idle. A good way out of this situation was in 1996 the sale of 5 locomotives of the series. On March 20, 1996, the narrow gauge engines were loaded onto normal track wagons and transported to the port of Bourgas and loaded onto a ship with which they were transported to Argentina. There they were sold to serve a narrow-gauge railroad between the coal mines in the Rio Turbio village and the Rio Galegos port, about 200km in the Santa Cruz area of Patagonia. One of the remaining 5 locomotives was scrapped and the rest continue to work on the Septemvri–Dobrinishte narrow-gauge line.

Operational and Factory Data for Locomotives[1]
Operational number fabr. № / year Notes
77 001.6 25325/1988 Sold to Argentina 1996
77 002.4 25326/1988
77 003.2 25327/1988 Sold to Argentina 1996
77 004.0 25328/1988 Sold to Argentina 1996
77 005.7 25329/1988
77 006.5 25330/1988 Scrapped 2004
77 007.3 25331/1988 Sold to Argentina 1996
77 008.1 25332/1988
77 009.9 25333/1988
77 010.7 25334/1988 Sold to Argentina 1996

Sources
  1. Translated from Локомотиви БДЖ серия 77.000
  2. Димитър Деянов, Локомотивното стопанство на БДЖ 1947 – 1990, Sofia, 1993
gollark: Do you mean homomorphic encryption or something?
gollark: <@160279332454006795> So PotatoASM™ (coming soon)?
gollark: The trouble, although in general I think this is good, is that you can't really have some code run without it being possible for people to inspect it in some way.
gollark: It could be trivially decrypted with the public key which ships with all potatOS builds, which is basically the point.
gollark: Actual "cryptographic obfuscation" would be, I don't know, encrypting stuff with the potatOS signing key™?

References
  1. Димитър Деянов, Стефан Деянов, Локомотивите на Българските държавни железници, Sofia, 2008, page 258
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