Recovering A Broken Down Battery-Electric Train
I was on a bus recently, where the brakes locked on and we had to all get off and wait to be rescued, by the next service.
To aid recovery on trains, it is usual for a broken-down train to be able to be rescued by another train of the same type.
But how do you rescue a battery electric train?
There will be two main groups of failures.
- Those where even the world’s most powerful locomotive will be unable to move the train.
- Those where a train with enough power can move the train to safety.
Let’s assume we have a four-car battery electric train.
- Trains can run for 40 miles, when starting with a full battery.
- Trains can run as pairs to provide higher capacity services or recover trains.
It is running on a ten-mile single-track branch line with a terminal station at the remote end.
It would be reasonable to assume, that the train could do two round trips before it needed a recharge.
The battery could also be said to have a capacity 160 car-miles.
Suppose a train broke down for some reason at the remote end, with a fault, that still allows the train to be moved, by towing.
- A second train can be used to remove the first train.
- It will use up 40 car-miles of energy to reach the first train.
- This leaves 120 car-miles of energy in the battery.
- When the two trains are connected, they are an eight-car train.
120 car-miles of energy in the battery, should be able to move the pair of trains fifteen miles.
I suspect that track layouts for battery-electric trains are designed with care, so that one train has enough battery capacity to rescue another.
US Utility Xcel To Put Form Energy’s 100-hour Iron-Air Battery At Retiring Coal Power Plant Sites
The title of this post is the same as that of this article on Energy Storage News.
This is the first two paragraphs.
‘Multi-day’ battery storage startup Form Energy’s proprietary iron-air battery is set to be deployed at the sites of two US coal power plants due for retirement.
Form Energy said yesterday that definitive agreements have been signed with Minnesota-headquartered utility company Xcel Energy for the two projects, one in Minnesota and the other in Colorado.
On their Technology page, they say this about their battery storage technology.
Our first commercial product is an iron-air battery capable of storing electricity for 100 hours at system costs competitive with legacy power plants. Made from iron, one of the most abundant minerals on Earth, this front-of-the-meter battery will enable a cost-effective, renewable energy grid year-round.
They also seem to be very much into grid-modelling technology. As I’ve build mathematical models for sixty years, I like that!
It does seem Form Energy is on its way.
The Anonymous Widower 