Electronic Automatic Twin Output Track Cleaner for use with all types of controllers Requires T1, M1 transformer
Input: 16v A.C. at a maximum of 1.25 amps
Measurements: 109mm x 68mm x 20mm

The HF-2 is compatible with the SS-1, SS-2 and SS-3
Not suitable for use with DCC systems or DCC decoder equiped locomotives/trains

This system provides lighting for locomotives and/or rolling stock, and is operated independently of the locomotive motor control. This means that by fitting a switch into the 16v AC supply the lights can be turned on or off whilist the loco is in motion, or even when stationary.
Input: 16v AC at a maximum of 1.25 amps Requires T1, M1 Transformer
Measurements: 76mm x 59mm x 27mm

The HF-3 is compatible with the SS-1 and SS-2, and only with the SS-3 if a 0.47 mF capacitor is used to bridge each track break or each track section is wired individually to the HF-3. The HF-3 is not compatible with the HF-1 and HF-2.
Not suitable for use with DCC systems or DCC decoder equiped locomotives/trains.