Hi.. I am working as a signalling engineer in Railways. This weekend i am going to give a presentation on super capacitors and their use in railway systems. Most importantly i am going to show how we can replace batteries with super capacitors (EDLC). The problem i am facing is i don't have any practical experience with capacitors and don't know how to show a relation between a battery and a corresponding equivalent capacitor. The type of battery we are using for driving the point machines (Google search "point machine railways") is of the type (Please refer to the attached image). Now what i need is an equivalent type of super capacitor which will be able to drive the same type of point machine. Guys if anyone of you who has an experience in this field please help me in finding the answer of the following questions: 1. What will be the equivalent value of the super capacitor for the above mentioned battery? 2. What will be the dimensions of such a super capacitor? 3. How much will it weigh? 4. Model or company's product which i will be able to use (links are most welcomed). All suggestions are welcome.