TCDD DE24000

TCDD DE 24000 (stylised as DE 24 000 in painted registration numbers) is a type of diesel locomotive built for operations on Turkish State Railways (TCDD) by Tülomsaş. 218 units were built between 1970 and 1984 under license from Matériel de Traction Electrique (MTE) of France. The DE 24000 formed the backbone of the dieselisation of the Turkish railways during the 1970s. It follows the hood unit road switcher design, like most Turkish mainline locomotives. DE 24 000 is the most commonly found locomotive class in Turkey (418 units produced, more than 100 in usable state).

DE 24000 [1][2]
Two DE24000 locomotives pulling a westbound regional train.
Type and origin
Power typeDiesel-electric
DesignerMatériel de Traction Electrique, modified vastly
BuilderMatériel de Traction Electrique (first units)
Tülomsaş (all remaining)
Model1968
Build date1970–1984
Total produced418
Specifications
Configuration:
​
 • AARC-C
 • UICCo'Co'
Gauge1,435 mm (4 ft 8+1⁄2 in)
Bogies2
Wheel diameter1,100 mm (43 in)
Length22.67 metres (74.4 ft)
Loco weight113 tonnes (111 long tons; 125 short tons)
Fuel capacity4,960 litres (1,090 imp gal; 1,310 US gal)
Prime moverPielstick 16PA4V185(most units)[note 1]
Hedemora Diesel V16(some units)
RPM range679-1599
 • RPM low idle620
 • RPM idle650
 • Maximum RPM1680
Engine typeDiesel V16
AspirationTurbocharged
Alternator72V
Generator600VAC
Traction motorsDC traction motors
 • Rating 1 hour1200 (automatically governed)
 • Continuous1200 (automatically governed)
CylindersV16
TransmissionAC-DC
Gear ratio16⁄87 at traction motors
MU workingyes (with identical units) since 2017 revisions
Loco brakeAir brake
Train brakesAir brake
Safety systemsemergency brake, gas-generator notching decoupler, dead man's switch
Performance figures
Maximum speed120 km/h (75 mph) (designation)
144 km/h (89 mph) (overspeed with blue and accelerated trains-this practice prohibited)
Power output:
​
 • Starting1,760.0 kW (2,360.2 hp) (original rating with Pielstick engines)
1,610.0 kW (2,159.0 hp) (re-rating and all units with Hedemora engines)
 • 1 hourno restriction
 • Continuous2,200.0 hp (1,640.5 kW) (road use)
1,860.0 hp (1,387.0 kW) (switching duties)
Tractive effort:
​
 • Starting394 kilonewtons (89,000 lbf)
 • Continuous357 kilonewtons (80,000 lbf) @ 16 kilometres per hour (9.9 mph)
Career
OperatorsTurkish State Railways(36 units)
İZBAN(6 units)
TCDD Taşımacılık (remaining)
NumbersDE24001 – DE24418
Nicknames"Mavi lokomotif" (blue locomotive-ones with blue livery)
Yirmidörtbinlik (24000ths)
LocaleTurkey

In addition to MTE, diesel parts were supplied by Chantiers de l'Atlantique, electric parts from Jeumont-Schneider, and mechanical parts from Forges et Ateliers du Creusot.

History

During the 1970s the Turkish State Railways decided to replace their 800 steam locomotives with diesel. This quite-delayed task required the delivery of more than 400 diesel units. On February 15, 1968, TCDD and MTE signed an agreement for delivery of the DE 24000 along with the delivery of the smaller DE18000. To build up domestic competence on diesel engines, TCDD decided that the production would be done by Tülomsaş of Turkey. Only Tülomsaş-built units are still operational.

Blue trains (Mavi tren) and DE 24000
Main article: Blue Train (Turkey)

Blue trains are express passenger trains with 120 km/h (75 mph) timetable speed. They originally started replacing black trains (Turkish: kara tren), which are trains pulled by black steam locomotives with tenders. All cars of the blue trains had blue livery and were pulled by blue DE24000s. They are now pulled by TCDD E68000s and have regular livery but still retain their long-distance national passenger rail network status.

Overspeeding provision

These locomotives had been used over their power and speed ratings until 2004. Delayed trains were "force-fit" into the timetable by overspeeding up to 10% over timetable speeds. This required both overspeeding the prime mover and modifying the traction motors' final drive ratios. This practice was banned after the Pamukova train derailment.

DE 24409 at Alsancak.
  1. Tönük, Ergin. "E 40003".
  2. "Trains of Turkey - DE 24 000".
  1. Replaced by clones manufactured by TÜLOMSAŞ(TLM 16V185) as they go under maintenance.
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