HRD Flyer ARTC-WSLSL v3.0 The HRD ARTC-WSLSL Working Safely in Live Signal Locations course information, version 3.0 dated 13th March 2020.

HRD Flyer Rail Signal Wiring (RSW) v3.0 The HRD Rail Signal Wiring (RSW) course information, version 3.0 dated 15th March 2021.

HRD Flyer TLI31921 v4.0 The HRD TLI31921 Certificate III in Mechanical Rail Signalling course information, version 4.0 dated 5th March 2021.

HRD Certification Units TLI31921 The units provided by HRD for the TLI31921 Certificate III in Mechanical Rail Signalling, dated 5th March 2021

HRD-Test interlocking frames-flyer v3.0 050321