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Locomotives and Rolling Stock

Steam, Diesel (WDM, WDP), Electric (WAP, WAG, WAM) classes and coach types (ICF, LHB, Vande Bharat).

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Locomotives and Rolling Stock — Core

Steam, Diesel (WDM, WDP), Electric (WAP, WAG, WAM) classes and coach types (ICF, LHB, Vande Bharat).

Locomotives and Rolling Stock — types, classification, manufacturers
Notes

LOCOMOTIVE = the engine that pulls the train.
ROLLING STOCK = the coaches, wagons, and locomotives together.

ERAS OF LOCOMOTIVES:

  1. Steam (1853–1995): wood/coal-fired. Phased out commercially in 1995.
  2. Diesel (1957–present): still used in non-electrified routes.
  3. Electric (1925–present): most common today. India is 100%+ electrified on broad gauge as of 2024.

LOCOMOTIVE NAMING CODE (Indian Railways):

Pattern: [gauge][power][role][series]

Example: WAP-7 = W (broad gauge) + A (AC electric) + P (Passenger) + 7 (series).

Gauge codes:

  • W = Broad gauge (1676 mm, standard in India).
  • Y = Metre gauge (1000 mm, almost phased out).
  • Z = Narrow gauge (762/610 mm, only mountain railways).

Power codes:

  • D = Diesel.
  • A = AC electric.
  • C = DC electric (mostly phased out except Mumbai suburban historically).
  • C/A = Dual-voltage.
  • S = Steam (historical only).

Role codes:

  • P = Passenger.
  • G = Goods.
  • M = Mixed (passenger + goods).
  • S = Shunting.

FAMOUS ELECTRIC LOCOMOTIVES:

WAP series (passenger, AC electric):

  • WAP-1: earliest (1980s). 4000 HP. Now retired.
  • WAP-4: 5000 HP. Workhorse till 2010s.
  • WAP-5: 6000 HP. Imported tech (ABB). Powers Rajdhani/Shatabdi.
  • WAP-7: 6350 HP. Indigenous. Most common modern passenger loco. Powers Vande Bharat, Rajdhani, Shatabdi, etc. 2/3 of India's electric passenger trains run on WAP-7.

WAG series (goods, AC electric):

  • WAG-5: 5000 HP.
  • WAG-7: 5000 HP. Workhorse.
  • WAG-9: 6000 HP. Modern goods.
  • WAG-12B: 12,000 HP. India's most powerful, used on Dedicated Freight Corridor. Built at Madhepura factory (Bihar).

WAM series (mixed):

  • WAM-4: 3000 HP. Now retired.

FAMOUS DIESEL LOCOMOTIVES:

WDM series (mixed):

  • WDM-2: 2600 HP. Workhorse from 1970s-2000s. Now mostly retired.
  • WDM-3A: 3100 HP. Still in service on non-electrified routes.

WDP series (passenger):

  • WDP-4: 4000 HP.
  • WDP-4D: improved version, modern.

WDG series (goods):

  • WDG-3A: 3100 HP.
  • WDG-4G/4D: 4000+ HP.

MOST POWERFUL LOCOMOTIVE IN INDIA:

WAG-12B (also called Bharat Electric Loco):

  • 12,000 HP (8,950 kW).
  • Manufactured at Madhepura Electric Loco Factory (Bihar) by Alstom (later transitioned to Indian Railways).
  • Used on Dedicated Freight Corridor (DFC) for hauling heavy freight at higher speeds.

SEMI-HIGH-SPEED LOCOMOTIVES:

  • Vande Bharat (Train 18): distributed traction — no separate locomotive. Each coach has its own propulsion (similar to Shinkansen, EMU concept).
  • WAP-5 can run at 160 km/h (used on Gatimaan).

ROLLING STOCK — COACH TYPES:

Conventional coaches:

1. ICF (Integral Coach Factory) coaches:

  • Old design (1950s-2018).
  • Steel body, riveted construction.
  • Slower acceleration, less safe in collisions.
  • Phased out from premier trains.

2. LHB (Linke Hofmann Busch) coaches:

  • Imported tech from Germany (LHB Schienenfahrzeuge).
  • Anti-collision crash buffer (CBC couplers).
  • 200 km/h capable.
  • Air-suspension for smoother ride.
  • Indian Railways now manufactures LHB at MCF Raebareli, RCF Kapurthala.

3. Vande Bharat coaches:

  • Indigenous self-propelled (EMU concept).
  • Each pair of coaches has its own motor.
  • Designed at ICF Chennai.

COACH CLASSES (in order of comfort, low to high):

Code Class
UR / GS Unreserved / General
2S Second Sitting
SL Sleeper (non-AC)
3E AC 3-Tier Economy (Garib Rath)
3A AC 3-Tier
2A AC 2-Tier
1A AC First Class
CC AC Chair Car (day trains)
EC Executive Chair Car (Shatabdi/Vande Bharat)
EV Executive Anubhuti Class (premium)
FC First Class (non-AC, almost extinct)
H1 AC First Class with Royal interior (luxury trains)

MANUFACTURERS:

  • ICF Chennai: EMUs, MEMUs, Vande Bharat (2018+), conventional rakes.
  • RCF Kapurthala: LHB coaches.
  • MCF Raebareli: LHB + Vande Bharat partial.
  • BLW Varanasi (Banaras Locomotive Works, formerly DLW): WAP-7, WAG-9 electric locos. Earlier built diesel; transitioned 2020.
  • CLW Chittaranjan: Chittaranjan Locomotive Works — electric locos (WAG-7, WAG-9).
  • Madhepura Electric Loco Factory: WAG-12B (Alstom JV).
  • DMW Patiala (Diesel-Loco Modernisation Works): diesel loco overhaul.
  • DLW (Diesel Locomotive Works, Varanasi): renamed Banaras Locomotive Works (BLW) in 2020.

FREIGHT WAGONS:

  • BCN (Covered) — for cement, fertilizer, food grains.
  • BOXN (Open) — for coal, iron ore.
  • BOST (Tipping) — for ores at automated dumps.
  • BTPN (Tank) — for petroleum.
  • BRN (Rail) — for steel rails.
  • BCNHL (Covered High capacity) — modern.

EXAM HOOKS:

  • Naming: gauge-power-role-series (e.g., WAP-7).
  • W = broad gauge; A = AC electric; P = passenger; 7 = series.
  • Most powerful: WAG-12B (12,000 HP).
  • ICF (old) → LHB (modern) coaches.
  • Vande Bharat = distributed traction EMU.
  • 1995: steam loco phased out.
  • 100% broad-gauge electrification achieved 2024.
  • BLW = Banaras Locomotive Works (renamed from DLW, 2020).