To all the track power gurus.
A friend has a double track mainline. He made up a double track crossover using four LGB 1800’s and a 30 degree crossing. Each mainline is powered by a separate LGB Jumbo. The 30 degree is insulated at all 8 track joiners.
If both Jumbos are set to the same voltage and the same direction, can he safely throw the switches and cross over without any problems? Either to the lokie or the Jumbos?
(I know, I know—battery/rc would solve the problem, but that is out of the picture at this time.) 
Thanx,
jb
Used to do it in the smaller scales all the time.
I suppose that the Germans engineered something into those to prevent it, right?
A tip:
Wire a red light across the crossing gaps.
If the power is reversed, you will get a red light.
If it was mine, I’d fuse the outputs of both with a 3 amp fuse and try it.
TOC
John,
The only safe way to do it is to wire the whole arrangement in two blocks just like in the smaller scales.
Unfortunately that means more complicated wiring back to a central control panel.
Don’t forget the fuses on each Jumbo output.
Each mainline is a separate block, with it’s own Jumbo.
And both are fused with a fast blow, but I don’t know the ratings.
I’ll give it a try and see what happens.
Thanx, guys.
jb
John I meant the area of the four turnouts and the crossover should be wired so that that particular area can only be accessed by one Jumbo at a time. That means stopping one loop whilst you transfer to the other.
Oh!!! the agrony of it all.
John,
If it was my problem, I would measure the potential between the two separate circuits. I remember back in the very dim past (circa 1974) having set-up something similar and the train would accelerate “considerably” across the gap - while going in the same direction - since there seemed to be the sum of the voltages across the gap. 
Now this was prior to smartening up and getting with the program by using common rail for the one feed.
Set the Jumbos at half throttle and give it a try! 
Note to TOC:
The only thing the Germans engineered into the Jumbos is for them to distinguish if you’re running LGB equipment. If you aren’t, the Jumbo will decide to “give her”! 
HJ,
So yer sayin’ that as the loco bridges the crossover (A dismal-for instance-will have each set of trucks resting on each block) I will get double the voltage to the loco ??
I guess crossing a very slow speed would be ok then. But I wanted to cross at track speed. 
I’ll test it with an old POS Aristo U-boat to see if I can burn the unit up. Not much loss there. It’s expendable.
jb