11 and a half
Plus I was also a member of the pre-phpBB forum, whilst I got transferred over my joining date got lost in the ether.
Like Ash, my fondness for train simming has waned over the past couple of years, though oddly my interest in the real thing has increased, and I now have a job involved in railways (well, trams!).
I fondly remember those early days when MSTS was new and exciting - the difficulties in getting all wheels to spin on the 'new' class 47 models was one I recall from the early days; shortly followed by the bogies pivoting the wrong way if you reversed the loco in the consist editor. I also remember getting very bored of the default S&C, so would regularly put what little freeware British stock there was at the time on the Marias Pass!