One large power supply is fine, but I would still break it out into seperate circuits with fuses or circuit breakers to run a group of lights on each circuit - think your main electrical panel in the house.
--Randy
Modeling the Reading Railroad in the 1950's
Visit my web site at www.readingeastpenn.com for construction updates, DCC Info, and more.
An old computer power supply of 150 Watts or more should be sufficient for the number of lights and other items you have drawing power, and even new ones are not that expensive.
All Electronics has larger power supplies. I think they have 5-amp, 12 volt supplies now. If you order one, get a fuse holder and a package of 4-amp fuses, or a bit below the rating of whatever supply you get. Install the fuse in series with the output of the supply.
These supplies do not have circuit breakers. Instead, they have a 1-time fuse buried inside, to keep them from burning your house down. Once that goes, you have a paperweight. An exterior fuse that's easy to change is worth it. Don't bother asking how I know.
It takes an iron man to play with a toy iron horse.
Are all the items being operated right now?
Quite a few gives us no real details.
What voltage do the different ones require?
Are the transformers actual power packs or strictly a transformer, i.e, 110 vac in and low voltage ac out?
Rich
If you ever fall over in public, pick yourself up and say “sorry it’s been a while since I inhabited a body.” And just walk away.
I have quite a lot of lights, motors, on my n scale layout. I now have five 12v transformers to run all the lights etc, what do you recommend for accessory power supply that would be large enough to run all my lights?