tr1;will a group of 18AWG wires, originally set up for single locomotive dc operation. handle DCC dual locomotive operations
N scale would definitely give you a decent layout in that space. Z scale is even smaller so it would give you even more. TT is between N and Ho so would also give you a nice layout. From what I have heard N has the most variety of locos, rolling stock buildings and figures of the 3. My advice would be go to a hobby shop and physically see what one looks best to you and check online to see what’s available in each. For me personally Z is out of the question I model in N and I can barely see that! Good luck!