No official Railway Board PDF has been traced for this entry yet. The text below was read from the document held in the library.
| Type | Commercial Circular |
|---|---|
| Topic | train-services |
| Currency | Currency not verified |
Generally, MEMU’s are normally 16 or 20 coaches whereas EMU’s generally of 12 coaches.
<!-- Slide number: 1 --> # WORKING OF EMU/DEMU/MEMU <!-- Slide number: 2 --> # EMU Multiple unit train consisting of self-propelled carriages using AC traction. Quieter than DMUs and loco hauled trains. Requires no separate loco, as AC Traction motors incorporated within one or a number of the carriages. Popular on commuter and suburban rail networks. Faster acceleration and pollution & noise free operation. <!-- Slide number: 3 --> # EMU  <!-- Slide number: 4 --> # EMU One unit consists of 3 coaches. One motor coach and 2 non motor coaches among the 3. These are multiplied as 3 or 4 making it a 9/12 coach train as generally mentioned in the front of the train. <!-- Slide number: 5 --> # Difference between EMU & MEMU EMU is Electrical Multiple Unit Runs in the suburban sections of major cities. MEMU is Mainline Electrical Multiple Unit Runs on mainline generally for distances more than the suburban sections. MEMU runs on the same line on which normal Local/Exp/Mail/SF trains run. <!-- Slide number: 6 --> # MEMU  <!-- Slide number: 7 --> # EMU In EMU one power car is required for 3 coaches. An EMU 12 coaches in length will have 4 power cars. Whereas MEMU one power car is needed for 4 coaches. Generally, MEMU’s are normally 16 or 20 coaches whereas EMU’s generally of 12 coaches. EMU & MEMU both run on AC traction. DEMU runs on diesel traction <!-- Slide number: 8 --> # DEMU Primary source is diesel. Diesel engine powers an alternator and subsequently feeds the electric motors. Just differ in how they are powered externally with MEMU. <!-- Slide number: 9 --> # DEMU  <!-- Slide number: 10 -->  <!-- Slide number: 11 -->  <!-- Slide number: 12 --> <!-- Slide number: 13 --> <!-- Slide number: 14 --> <!-- Slide number: 15 --> <!-- Slide number: 16 --> LP of EMU/DEMU permitted to leave engine to speak to SM over SPT in IBP. While doing so, he apply brakes and extract brake isolation valve key (BIV), Reserve key and bench lock key duly advising guard to be available in cab, apply brakes and place wedges to wheels if required. <!-- Slide number: 17 --> <!-- Slide number: 18 --> Side lights are dispensed with on EMU trains. [GR 4.15(a)] LPs of DEMU/MEMU trains are exempted from exchange of all-right signals. [SR 4.42 (vi)]. <!-- Slide number: 19 --> | Sl No | Code of Bell | Indication Signals | Acknowledgement | | --- | --- | --- | --- | | 1 | O | Stop Train | O | | 2 | O O | Start Train | O O | | 3 | O O O | Guard required by LP | O O O | | 4 | O O O O | Protect train in rear | O O O O | | 5 | O Pause O | Restriction over & resume normal speed | O Pause O | | 6 | OO Pause OO | Passing Auto Signal at “ON” | OO Pause OO | | 7 | OOO Pause OOO | Loco Pilot not to exceed prescribed speed | OOO Pause OOO |
Open this circular in the search app · Search all 4,233 documents