The main reason for using underlay is to help to reduce the noise on your layout. If you run your train on track...
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TT:120 Code 55 Double Straight rails (pack of 4)
TT:120 Code 55 Standard Straight rails (pack of 4)
TT:120 Code 55 Short Straight rails (pack of 4)
TT:120 Code 55 Double Curve rails 2nd Radius (pack of 4)
TT:120 Code 55 Standard Curve rails 2nd Radius (pack of 8)
TT:120 Code 55 Half Curve rails 2nd Radius (pack of 4)
Horse Drawn Wedding Carriage (Open) Figure Set
Deutz D6206 (2) Tractor Kit
Female Sunbathers (6) Figure Set
Horse Drawn Farm Wagon with Sack Load
Horse Drawn Flat Wagon with Vegetable Load
Saint Boniface Figure
Xi Jinping Figure
Rifle Association Band (12) Figure Set
Prominent Persons in Horse Drawn Carriage Figure Set
East German Railway staff and passengers
Despatch Employee Figure
Storks with Nests (2) in cartwheel
Action set: Hay Harvest
Single Track Profi Hard Foam Tunnel Portal
TT:120 GWR BRACKET SIGNAL KIT
Repair Ramp With Welding Machine And Welder
Action set: debarking
Action set: sunburn
Action set: carrying a boat
Sailing Boat Optimist + Trailer + Figure
Farmer's Wife with Chickens
Plymouth Barracuda Gold 1965
1950 Nash Rambler Custom Landau Convertible (Closed) Strato Blue
1960 Ford Fairlane Sedan 500 Town Monte Carlo Red/Corinthian White
Double Track Profi Hard Foam Tunnel Portal
Pedestrians with Luggage (6) Hobby Figure Set
Cyclists (3) and Accessories Figure Set
TT:120 GWR JOINT HOME & DISTANT SIGNAL KIT
TT:120 GWR HOME/DISTANT SINGLE ARM SIGNAL KIT
Painted Red Telephone Box
Metal Rail Joiners 10 Pieces G scale
Benches (6) and Litter Bins (3) Accessory Set
Sitting People (6) Hobby Figure Set
Motorcyclists (2) Figure Set
Unpainted Figure (72) Starter Set
Cats and Dogs (10) Figure Set