I will have to research this, but I am proposing either the Palo Verde and Southwestern RR of Dennis Serrine in Mesa AZ, or The Dynamite and Rio Verde Eastern in Scottscale Az. This is where the Worlds longest Model train record was attempted this year. I have got to check a couple of videos.
TC Movie-Mix has just produced a DVD on the Worlds Longest Model train attempt. This was done at the Dynamite Rio Verde and Southeastern RR in North Scottsdale. In that DVD they claim that this RR has a double track mainline of 1252 feet for each mainline. This clearly has to be one of the longest mainlines there is.
TC Movie Mix is also about to release a DVD of Dennis Serrine's Palo Verde and Southwestern RR. If you go to Youtube and search for this RR the Number 50 version states that there is a double track mainline of about 4000 feet. I am taking this as 2000 ft per mainline, but I could be wrong. I have seen another video that says something like 3700 total feet. Whatever, I would vote for this layout as the biggest one Iknow about in my limited experience.
I would say Dennis is about as big as I've seen. Marty when I edit my photos I will post how his RR is fasten down. One thing I asked him is did he laser line the track as you want to see good track he has it. Of course he had done the laze line as I expected. You can not fool a good track mans eye. Of all the RR I toured this year his was with out a doubt unbelievable. Lets say I was I'm pressed. Later RJD
In the picture, the curvy driveway is to his house. The smaller building with the red tile roof is the train shop. The main layout is to the right of that. There are 3 more areas sectioned off above.
The one next to the house is for back yard, the square one with the 45 degree "bite" out of it, and the triangular part to the right were being expanded into when we were there at the NGRC this year.
It's bigger than you think, because his house is huge. The smaller building is as large as most people's houses.
He has concrete base, then rubber roadbed on top and everything is screwed down. He uses a ton of "expansion tracks", the kind with the sliding rails. R.J. and Ted Doskaris and I talked to him for quite a bit.
All track is aligned with a laser, and it looks it, the trackwork is perfect, nothing less, you could not see a flaw anywhere, and R.J. was on the lookout!
He uses a combination of track power and AirWire on battery. All switches are air powered.
A bunch of us in the ABTO get together once a month (weather permitting) to run trains at Dennis's layout. It is truely fantastic and he still has a lot of work to do it. The unused space just above the layout is space reserved for his "Mountain Division" Eaglewings Ironcraft sponsors a Garden Train show every April and Dennis usually runs during the show. People come in from all over the country just for the show to watch the trains. He was running a couple of weekends ago as part of the ABTO's Christmas show. I will try to get him to provide details of his track installation techniques ans post them.