Source
From the release:
NSAG3 Limber and 4 horse team £15.50
NSAG4 Limber and 6 horse team £19.50
NSAG5 Caisson and 4 horse team £21.95
NSAG6 mounted train officer £2.85
NSAG7 mounted artillery train trumpeter £2.85
The 6 horse team limber is for horse artillery