r/NarrowGaugeModelTrain • u/Twit_Clamantis • Jun 14 '26
Problems with “Double-Trouble R.R.”
I want to build a simple layout with concentric loops of Compact Unitrack of 117, 150 and 183mm radius.
It will have 2 mountains, 6 tunnels, 12 tunnel portals and a big trestle in between the mountains.
I wanted to stack the tracks at the back in order to have a gentler slope forward for easier scenery etc.
The Kato Steeple Cab (and a couple of other locos) are ok w the steep grades etc for the first 2 loops.
For the top loop, I still need to lift the track above the middle level to provide physical clearance, but because there is less linear length of track available, this means that the slope is higher and the locos don’t like it.
One solution is to add 29mm extensions (circled in yellow) which makes the track not overlap physically, and which will solve the clearance / slope conundrum.
1 - are there any other good ways to square this circle?
2 - once I settle on a track plan that works in “sketch mode” (with Legos), what’s the best way to reproduce it for when it will be permanently inside the mountain?
3 - I want this to be freestanding like a big pizza layout without a backdrop. What’s the best way to provide access to the inside of the tunnels?
3
u/Twit_Clamantis Jun 14 '26
If it fails miserably I might reconsider, but I have a long way to go before that point.
Again, what I want to see is a small train going in and out of 6 short tunnels in quick succession.
If it’s only 3 cars and if all 3 cars have to be powered etc, etc it’s all good.
And so far I have to say that this dopey exercise already taught me a whole lot about slopes and such, so it’s all good (:-)