Financial Viability of different systems of power supply(1) HOG system is considered to be the most economical for the reason the cost of generation is minimum, but the issue is that the head on locomotive is not wedded to the train. If for some reason, it is detached, there is no source of power, therefore, one power car has to remain in the system. There is one more angle to this, that if the power car become mechanically sick en route and detached then continuation of both the power cars justified even with HOG. This is the reason that there is not much enthusiasm for HOG.(2) There is always debate about the economics of SG versus EOG and each group justifying in his own way. EOG favours all factors over SG, except two i.e. the earning capacity of the power car and loosing flexibility of interchangeability . For this, the initiative was taken to develop under slung mounted DG set, thus releasing the space for luggage. If this is done, all economics will shift towards to EOG system. As regards, flexibility of interchangeability, successful running of LHB coach train mix with AC and Non-AC on EOG has proved this wrong and is only a fear.(3) The most important financial, practical and workable solution is to develop under slung mounted DG sets in two versions of 2×750 kW and 2×250 kW for fully AC and mix train of AC and non-AC coach . This will release 50% of the space presently used in the power car for DG set and power panels. The design of the power panel shall be so chosen to have the flexibility to draw power from HOG as well. The cost of electric energy through HOG will be much less as compared to EOG.RDSO initiated the development process about 10 years ago, but not yet successful. This one development alone can change the complete scenario of power supply system benefitting Indian Railways in the following respect.Energy Efficiency: The energy efficiency of SG system is very poor if the efficiency of the entire system of mechanical power generation at the train head to conversion into electrical is taken into account and works out to be around 50% as compared to 80% of EOG.and Maintenance Cost: The capital and maintenance cost of a large number of under slung mounted equipment such as alternator, pulley, belt, Electronic regulator, battery and invertor will get a go bye with the addition of maintenance cost of four numbers of DG sets and their panel. It is the total quantity of these items in SG coaches that makes the difference in all aspects of reliability and maintainability.

Question

Financial Viability of different systems of power supply(1) HOG system is considered to be the most economical for the reason the cost of generation is minimum, but the issue is that the head on locomotive is not wedded to the train. If for some reason, it is detached, there is no source of power, therefore, one power car has to remain in the system. There is one more angle to this, that if the power car become mechanically sick en route and detached then continuation of both the power cars justified even with HOG. This is the reason that there is not much enthusiasm for HOG.(2) There is always debate about the economics of SG versus EOG and each group justifying in his own way. EOG favours all factors over SG, except two i.e. the earning capacity of the power car and loosing flexibility of interchangeability . For this, the initiative was taken to develop under slung mounted DG set, thus releasing the space for luggage. If this is done, all economics will shift towards to EOG system. As regards, flexibility of interchangeability, successful running of LHB coach train mix with AC and Non-AC on EOG has proved this wrong and is only a fear.(3) The most important financial, practical and workable solution is to develop under slung mounted DG sets in two versions of 2×750 kW and 2×250 kW for fully AC and mix train of AC and non-AC coach . This will release 50% of the space presently used in the power car for DG set and power panels. The design of the power panel shall be so chosen to have the flexibility to draw power from HOG as well. The cost of electric energy through HOG will be much less as compared to EOG.RDSO initiated the development process about 10 years ago, but not yet successful. This one development alone can change the complete scenario of power supply system benefitting Indian Railways in the following respect.Energy Efficiency: The energy efficiency of SG system is very poor if the efficiency of the entire system of mechanical power generation at the train head to conversion into electrical is taken into account and works out to be around 50% as compared to 80% of EOG.and Maintenance Cost: The capital and maintenance cost of a large number of under slung mounted equipment such as alternator, pulley, belt, Electronic regulator, battery and invertor will get a go bye with the addition of maintenance cost of four numbers of DG sets and their panel. It is the total quantity of these items in SG coaches that makes the difference in all aspects of reliability and maintainability.

Karan Singh · Accepted Answer

Financial Viability of different systems of power supply(1) HOG system is considered to be the most economical for the reason the cost of generation is minimum, but the issue is that the head on locomotive is not wedded to the train. If for some reason, it is detached, there is no source of power, therefore, one power car has to remain in the system. There is one more angle to this, that if the power car become mechanically sick en route and detached then continuation of both the power cars justified even with HOG. This is the reason that there is not much enthusiasm for HOG.(2) There is always debate about the economics of SG versus EOG and each group justifying in his own way. EOG favours all factors over SG, except two i.e. the earning capacity of the power car and loosing flexibility of interchangeability . For this, the initiative was taken to develop under slung mounted DG set, thus releasing the space for luggage. If this is done, all economics will shift towards to EOG system. As regards, flexibility of interchangeability, successful running of LHB coach train mix with AC and Non-AC on EOG has proved this wrong and is only a fear.(3) The most important financial, practical and workable solution is to develop under slung mounted DG sets in two versions of 2×750 kW and 2×250 kW for fully AC and mix train of AC and non-AC coach . This will release 50% of the space presently used in the power car for DG set and power panels. The design of the power panel shall be so chosen to have the flexibility to draw power from HOG as well. The cost of electric energy through HOG will be much less as compared to EOG.RDSO initiated the development process about 10 years ago, but not yet successful. This one development alone can change the complete scenario of power supply system benefitting Indian Railways in the following respect.Energy Efficiency: The energy efficiency of SG system is very poor if the efficiency of the entire system of mechanical power generation at the train head to conversion into electrical is taken into account and works out to be around 50% as compared to 80% of EOG.and Maintenance Cost: The capital and maintenance cost of a large number of under slung mounted equipment such as alternator, pulley, belt, Electronic regulator, battery and invertor will get a go bye with the addition of maintenance cost of four numbers of DG sets and their panel. It is the total quantity of these items in SG coaches that makes the difference in all aspects of reliability and maintainability.

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