Proto 1000 (Life-Like not Walthers) ALCO RSC2 with Soundtraxx DSD-LL110LC ALCO 1st Generation Decoder. The speaker is a 16mm x 35mm 1/2 watt unit from GC. This speaker was chosen to maximize volume from the decoder. This is an infinite baffle design. The volume is low unit the shell is installed. To eliminate the rear LED flicker when addressing the decoder a snubber (.1 microfarad, 50 volt cap in parallel with a 1000 ohm resistor) was installed ACROSS the rear LED.