No:3 CCS and No:23 Ambulance Train

My Granddad was admitted to No: 3 Casualty Clearing Station on the day he was wounded [8/4/1917].
His wound was recorded as 'Wound type IX4'.  Gunshot wound of lower extremities, compound fracture of.
His notes say this made him eligible for a wound stripe to wear on his uniform.
There is also a note '500 units of anti-tetanus serum administered on 8/4/1917'.
He was then transferred on to No: 23 Ambulance Train on 11/4/1917.  This train would have taken him to one of the Base Hospitals at one of the channel ports.

No: 23 Ambulance Train.

3CCS was located at Aveluy just north of Albert [back down the road near where he joined the battery].  It had been there a month and was packing up ready to advance again with the army, to Grevillers just west of Bapaume.