Use SL-310 metal joiners and SL-1208 joining sleepers. Use SL-311 insulating joiners to create isolated track sections (if using DCC control these are not required).
One of the great advantages of TT:120 is that the 12mm gauge track correctly scales out as standard (4' 8.5") gauge, as used all over Britain's railway network. The ingenious rail section of PECO code 55 combines strength and durability with a highly realistic appearance – In TT:120 the visible height of the rail correctly represents 113lb flat bottom rail. The flexible sleeper base is detailed with fine wood grain and spikes through British Railways’ BR1 baseplates under the rails, a combination that continues to be widely used on Britain’s railways.
Code 55