Electric motors powered by batteries are a popular power source for miniature trains. But the capacity of the batteries
limits the time on task before they need to be swapped or the vehicle taken off task while they are charged.
Kinetic energy recovery systems are now well understood and widely used, so the possibility of recovering kinetic energy
from miniature trains seems a worthwhile ambition if it can extend their time on task.
This report (pdf) explores the technical issues involved.
It also provides some useful information to help constructors determine the motor requirements and optimum gearing
for their locomotives.