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BUILDING A NUMBER 8  TURNOUT
January 29, 2012
COMPLETED TURNOUT - It's a long one! Number "8" means the angle of the diverging track, eight inches length for every 1 inch of divergence.  
The higher the number, the lower the angle and the higher the speed possible for the trains on the curved side of the switch.  Most other turnouts on
the Calvert Central are Number 5 and Number 6.  This one will go on the straight section between Sunnyside and the girder bridge.
POINTS - The point rails are 24 inches long and are beveled using a band
saw.  The sharp end is secured to the throwbar with a drywall screw.
POINT PIVOT - The points pivot using another drywall screw fitted through
a hole drilled in the rail base..  The full size railroads use a modified joint bar.
FROG UNDER CONSTRUCTION - The "filler" between the rails is needed
to keep the wheels from dropping down between the rails.  We have cut two
plates of 1/4 inch aluminum.  The bottom plate rests on the bases of the rails,
and the top one fits just under the rail heads.
COMPLETED FROG - The filler is secured with the sides of the wing rails,
and a drywall screw is used to keep it from drifting lengthwise.  The flangeway
width is 10 mm at the frog.
GUARD RAIL - To get the proper gap, we had to cut the base of the guard
rail on the side adjouning the stock rail.  The cuts in the base are to help in
bending the ends of the guard rail.
FROG AND GUARD RAIL - It is very important to check the gauge of the
rails in this area.  The flangeway gap is smaller at the guard rails, wider at the
frog, so that wheelsets which are slightly out of gauge can roll through the
turnout smoothly.
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