DIY power supplies for your model railroad.
Locomotive Model Plans
Carton Built Models
Laser Cut Models
The first three links give you different views on how to power your model railroad using a computer power supply.
How to use a computer power supply for a model railroad.
Using a computer power supply for a model railroad.
Organizing the wires on a computer power supply.
This next video shows how to build your own power pack.
How to build a power controller using a discarded laptop computer or other appliance power supply.