Rapid Transit System Decals

I have been looking at some of the RTS decals on ebay, etc. Is there a specific design pertaining to certain years? (For instance, is there a design for a 1970 decal and a different design for a 1971 decal?) What about the one's that say "member" on them? Is there a story behind those? Does anyone know the original size of the decals? Where were these decals placed on the cars?
Any feedback would be appreciated. Thank you, ~Mrs.DustyEd