Bump! Got myself an Mtrax7000r and have had similar trouble sourcing info.
Based purely from memory, Raleigh's branding for quality lightweights (road and MTB) between the early and mid 90s. Late 80s/very early 90s catalogues simply featured the "Lightweight" branding, whilst mid/late 90s used the RSP/Raleigh Special Products ID. Pretty sure that M-Trax also denoted machines built using TIG-welded or brazed methods (Raleigh worked with Reynolds to bring in the TIG-compatible Optima steel tubeset during this time) instead of Dyna-Tech bonding.
"Not so much a religion as a savings club for people who think Star Trek's a documentary"
- Marcus Brigstocke on Scientology