Model/Horsepower Version NumberModel NumberNumber X 1000 HP | indian railway

🚂 The classification of Indian Railways locomotives is encoded in their name, which includes information about the gauge, motive power, purpose, and version/horsepower.
For Diesel Locomotives (since 2002), the model number and horsepower are often directly linked. For Electric Locomotives, the last number traditionally indicates the chronological model, not directly the horsepower.
Here is how the structure of the locomotive class name relates to your query:
🔢 Locomotive Naming Convention
A typical Indian Railways locomotive class name is a 4- or 5-letter/digit code (e.g., WDM-3A or WAP-7).
| Position | Denotes | Example (WDM-3A) | Example (WAP-7) |
|---|---|---|---|
| 1st Letter | Gauge | W (Broad Gauge) | W (Broad Gauge) |
| 2nd Letter | Motive Power | D (Diesel) | A (AC Electric) |
| 3rd Letter | Load/Purpose | M (Mixed Traffic) | P (Passenger) |
| 4th Digit | Model/Version Number / Horsepower Range (\times 1000 HP) | 3 (\approx 3000 HP range) | 7 (7th model of WAP) |
| 5th Letter (Diesel Only) | Horsepower Refinement (\times 100 HP) | A (+100 HP) | - |
⚡ Diesel Locomotive Horsepower/Model
For Diesel Locomotives (like WDM, WDG, WDP), the 4th digit and the optional 5th letter together denote the Horsepower (HP) range and Model/Version Number:
Model Number / Number X 1000 HP
The 4th digit of the classification (e.g., the '3' in WDM3A) indicates the approximate horsepower in thousands:
| 4th Digit | Horsepower Range (Continuous) | Example Class |
|---|---|---|
| 2 | \approx 2000 - 2900 HP | WDM-2, WDP-2 |
| 3 | \approx 3000 - 3900 HP | WDM-3 (A/D/F), WDG-3A |
| 4 | \approx 4000 - 4900 HP | WDP-4 (B/D), WDG-4 |
Horsepower Refinement
For diesel locomotives in the 3000 HP range (those with '3' as the 4th digit), a 5th letter is used to refine the power in 100 HP increments:
WDM-3A: 3000 \text{ HP} + 1 \times 100 \text{ HP} = 3100 \text{ HP} (Approximate)
WDM-3D: 3000 \text{ HP} + 4 \times 100 \text{ HP} = 3400 \text{ HP} (Approximate)
WDM-3F: 3000 \text{ HP} + 6 \times 100 \text{ HP} = 3600 \text{ HP} (Approximate)
💡 Electric Locomotive Model/Horsepower
For Electric Locomotives (like WAG, WAP), the 4th digit indicates the chronological model or version number of that series, and not the horsepower:
WAP-1, WAP-4, WAP-5, WAP-7: The numbers 1, 4, 5, 7 simply denote the sequential design/version of the Broad Gauge AC Passenger locomotive.
Horsepower Examples (Electric)
Electric locomotive horsepower is specified separately and is typically higher for newer models:
| Locomotive Class | Horsepower (Continuous) |
|---|---|
| WAP-4 | 5050 \text{ HP} |
| WAP-7 | 6350 \text{ HP} |
| WAG-9 | 6120 \text{ HP} |
| WAG-12B | 12000 \text{ HP} (Currently the most powerful freiwelcome to ak
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