Nathan.
Thank you again. I was thinking about connecting two smaller power supplies in "parallel'. However, I am only going to buy a good unit with a good power rating of at least two amps of steady duty.
Thank you.

 :)Nathan.
Thank you for your suggestions, I will start looking for the brand you advised me to buy (MRC power pack). I will also do as you suggested and try two power packs connected at equal distances.
Thank you.
I would not be doing this is it wasn't for all the kids and adults that keep asking for to have the train back. We had to take the original one down due to remodeling.

Nathan. all very good questions, the track level  is flat it will be used to go around the lobb in a Dairy Queen, the kids and adult all love it.
We previously had a track of about 30 ft. in length and if we run a scale G locomotive with three cars, after about 45 minutes it would stop.Probably overheated the speed controller.There will only be one train at the time and the track is the standard track that most G scale seem to share.
Thank you very much for any assistance.

can you please advice on proper amperage transformer needed for about 70 ft' of track? It will be going around a Dairy Queen lobby.
Thank you.