Back in March, 2023, started a TT:120 layout and the use of signals was one consideration. After some consideration for height, the choice was made to use the Dapol N Scale semaphores. For me, this proved to be an acceptable size signal to use in TT:120. There are always certain expectations when considering a working model like this. My choice was focused on the quality of the play value and in my opinion these signals are impressive. Their size appears appropriate to me and other visitors, who are always impressed with the mechanical operation of the semaphore blade. Are they two scale feet too short? Not important to me. Do they satisfy my desire to see operational semaphores that look to have a prototypical size? Yes, they do. In the end, I recommend the Dapol N scale semaphores for use with TT:120 Here are a few pictures to compare the size of signal and loco.