Secauspion Road

I'm posting this here because my web search for Secauspion Road turned up zero web pages - a most unusual event these days! Secauspion Road was a plank road constructed across the shell-wrecked swampland of the Ypres Salient during the Third Battle of Ypres (1917). I believe the name is a composite, derived from SECond AUStralian PIONeers. Does anyone have any confirmation, or any alternative ideas?

This was one of the fascinating trench and topographical names I discovered while scouring trench maps, divisional and regimental histories, war diaries and other sources, for my book Rats Alley - Trench Names of the Western Front (2006).