There are a couple of gauges smaller than N gauge, the most recognised being Z and T gauges.To give you an idea...
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50 ml UHU Por Expanded Polystyrene Glue
Bell ringing Mini sound effect
Babbling Brook Mini sound effect
Rapunzel Mini Sound effect
Polish AF / Army Helicopters paint set vol. 1
Polish Air Force Su-22M4 paint set
Russian AF Helicopters paint set vol. 1
Wild Moss, Small: 2mm 35 units.
Air Rescue Station Mini sound effect
Premium Large Track
Premium Small Track
Set of 2x 8 pin blanking plates
Flexi Track Tool N (pair)
Multi gauge track tester for OO, HO, TT and N
Multi-function tool that is likely to be highly useful in a wide range of craft and hobby scenarios.
340 - Sanding Files 20mm - Extra Fine 400/600
242 - Sanding Files 6mm - Medium 120/240 grit Pack of 10
3502 - Flexible Detail Sanding Kit Refills - 240 Grit Pack of 6
350 - Flexible Detail Sanding Kit Kit includes : 3 waterproof abrasive cushioned foam back pads 180, 240 & 400 grit 1 rubber holder
347 - Super Fix Glue Strips Pack of 6
343 - Sanding Files 20mm - Fine 240/320 grit Pack of 3
342 - Sanding Files 20mm - Medium 120/240 grit pack of 3
341 - Sanding Files 20mm - Coarse 100/180 grit Pack of 3
243 - Sanding Files 6mm - Fine 240/320
241 - Sanding Files 6mm - Coarse Pack of 10 Grit 100/180
354 - Adhesive Backed Abrasives & Profiling Sticks Kit contains one sheet of each grit 150, 320, 480, 600 & 1000 3 separate acrylic sanding shapes : Square, Triangle, Round
240 - Sanding Files 6mm - Extra Fine Pack of 10 Grit 400/600
2000 - Micro Finishing Cloth Abrasive Pads Pack of 6 Grit 3200 / 3600 / 4000 / 6000 / 8000 / 12000
143 - Sanding Files 3mm - Fine 240 / 320
142 - Sanding Files 3mm - Medium Grit 120/240 Pack of 12
141 - Sanding Files 3mm - Coarse Grit 100/180 Pack of 12
140 - Sanding Files 3mm - Extra Fine 400/600
Long Nickel Plated Model Railroad Track Fixing Pins 10g - 10mm
3503 - Flexible Detail Sanding Kit Refills - 400 Grit Pack of 6
3501 - Flexible Detail Sanding Kit Refills - 180 Grit Pack of 6
360 - Mini Sanding Sticks - 3 sticks of each 100, 180, 240, 320 & 400 Grit
372 Detail Tapered Hobby Files - 7 Piece Selection Pack