Yes, i wouldnt go too narrow.
though 2400 radius is a very nice bow where u have to use less or none widening of the centre-to-centre measurement.
Just a tip:
dont make the faults many builders make:
1.) it seems that u have some space to build. better give the tracks some mm more between.
2.) dont use JUST two different vehicles to test such things. take the suspected candidates and test them if u can two same cars vis-a-vis, or if u have just one candidate for big outranges, take a pen or pencil and hold it down on the outer edges AND on the inner middle of the car. Like this u can "plot" your critical-area-bows to see or measure hoe far u have to stay away.
Use this for buildings, bridge-piles, abutments, retaining-walls etc., too!
If u are just testing two different (but the 2 worse) cars, it could be that for some reason of geometry they dont touch each other, while they DO with other rolling stock.
AND i would let 15-20mm security distance on top.
Example:
I run Bachmann connies, one with a big plow in front (the K27-plow).
I mustnt think of any distance under 200mm!
So, while the connies reach far OUT because of the long front-frame, the passengercoaches reach far IN because in thight curves, they "cut" the curve with their length. So i always have to test:
1.) connie vs. connie
2.) connie vs. coach (outside dia.)
3.) connie vs. coach (inside dia.)
4.) coach vs. coach
each test forwards and backwards. dont forget that especially the locos with long front frame tend to jiggle. push them to the "most outside" position while testing.
Greetings
Frank
