"Mike Morris"
According to Mike Hiller engineer only two are left on the mainline. I will ask someone else.
In the testimony on 10 16 2007 made by Richard Hipskind at the
NTSB board meeting on the Mount Vernon Square wreck he states that WMATA has 173 #8 turnouts on the main line, of those 101 have been upgraded to guarded turnouts, WMATA has a program to upgrade the remaining 72 unguarded turnouts to guarded turnouts by the end of 2009. I got the impression from the testimony at the meeting that some of the originally installed #8 turnouts were replaced with #10 turnouts where space was available to do so.
I did a quick survey and counted 209 #8 turnouts on the main line. Mind you my count was based on designed practices from the 1970s.
John in the sand box of Maryland's eastern shore.