Our design uses the same frame, fuel tank, brakes, "trucks" and traction motors "below the deck" as a traditional diesel-electric switcher. Our hybrid locomotives are remanufactured from aging diesel-electric switchers by replacing the large diesel engine, generator and analog controls above the frame with a small genset, a battery pack and a computerized control module. We also install a new cab. Below the deck the key components are overhauled, but remain the same as conventional locomotives.
The batteries take up the majority of the space under the long hood, with a small space left over for the prime mover and generator. Since the batteries are heavy, they provide the weight needed to give the locomotive good traction.
While the diesel only runs as required to keep the batteries to the desired state of charge, power is always available without delay from the batteries. Since the load of the diesel/generator doesn't vary -- it's always charging the same batteries -- during the periods when it is running, it runs at a constant speed, and thus can be tuned to be very efficient. The result, compared to a conventional diesel-electric switcher, is a much quieter and more efficient locomotive that produces much less pollution.
MAIN COMPONENTS:
Microprocessor Control System:
Our control system is computerized such that the genset will start and run only so long as required to keep the batteries at the optimum state of charge. Unlike a traditional diesel-electric locomotive, whether or not the diesel engine is running, sufficient power is instantly available from the batteries of our hybrid locomotives.
Engine:
The traditional head-end power unit is replaced by a a large battery and small generator set ("genset") consisting of a motor: typically a 90 to 200 kW genset (480 V, 3 phase rectified to DC). The genset is generally run at a constant speed and which is connected to a generator to produce electricity. This electricity is then used to replenish a large bank of rechargeable lead-acid batteries which are, in turn, connected to the traction motors that power the locomotive. The batteries are kept at an optimum state of charge by the genset.
View Engine Image
Main Battery:
The main battery consists of latest technology valve-regulated lead acid, AGM type batteries. The battery, specifically designed by RailPower, is maintenance free, has a long battery life, and high round trip efficiency. The added weight of the battery helps to improve the tractive effort or "pull" of our locomotives and the ability to use large heavy batteries with lots of capacity is a key advantage of our application in contrast to the automobile industry where weight is a major issue and batteries need to be designed to be as light and energy dense as possible.
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Compressor:
The inverter-driven rotary screw compressor runs off power from the main battery and is easily accessible and maintainable.
View Compressor Image
Electrical Cabinet:
Accessible, standard components.
View Electrical Cabinet Image
Frame & Trucks:
Any locomotive platform can be used. Our design uses the same frame, fuel tank, brakes, "trucks" and traction motors "below the deck" as a traditional diesel-electric switcher.
View Frame & Trucks Image
Standard Control Stand:
The controls in our cabs are substantially the same as those in conventional diesel-electric switchers; thus, locomotive operators require minimal additional training to operate our locomotives. The controls, outfitted on RailPower's locomotives are designed to meet or exceed all US Federal Railroad Administration guidelines (Safety Advisory 2001-01 - pdf) and Transport Canada requirements. Furthermore, additional functions can be customized or expanded to meet customer requirements.
View Standard Control Stand Image
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