TTDS5HS DCC Signal 4 Aspect Outer Distant W/HS FlashingColour light signal based on the signals used on modern railways. These signals are quick and easy to install and do not require any soldering. These signals are pre built and just need to be inserted into the track using the two prongs attached to the signal. If you have already laid your track you can add wires to them rather than using the prongs. If you have already laid your track, you can add wires to them rather than using the prongs. Be sure