For those who care - Jones cars

[Fred W. Schneider III]

I've never found a lot on the conversion of Jones control cars to
K-control in Pittsburgh, but I found blue prints in the files at PTM
this week which provided a few insights that might be worth passing
along

Cars with M25 arch bar trucks:  3750, 4200, 4250, 4300, 4350, 4400,
4700, 4800, 4900, 5000, 5100, 5200, 5400, 5500, B300 trailers.

Cars with M24 arch bar trucks:  4250 and 4300.  Note that the previous
line shows these same cars with M25 trucks.  Are we to believe that a
few were altered?  What were the changes? DamfIknow.  But maybe this is
a clue to why most of the 4250s and 4300s were scrapped before the 4200s
and 4300s.

Cars with M26 arch bar trucks:  3700s.

Cars with M27 arch bar trucks:  3800s.

There were two other arch bar designs shown on drawings: M30 and M245,
and I have no idea which cars had them.  But we know that M283 and the
dump cars had much heavier arch bar trucks, presumably made by Diffco.
I have no idea what was under the 6000s either.  

And when were the 4300 Jones cars converted to K-control?  I found a
shop drawing showing the revised motorman's platform with K-control and
an M-20A brake valve.  The drawing was dated August 11, 1928.  

When did the 3700s get K control?  Don't know but I found a drawing for
a revised detent plate for the controller for series-parallel control
that was drawn in 1918.