December 2001 - Page 32
Modeling Santa Fe PS2-CD 4750 Covered Hoppers
by Ken Edmier
Photos by Ken Edmier and Tim Frederick
Part 1 appeared in the November issue.
GA-191 End Detail & Assembly
or the GA-191 class, the brake air tank is mounted on the left side and the triple valve is mounted to a bracket mounted on the right side. Prepare the brake air tank as on the GA-180 and install on the left side. M ake a bracket for the triple valve from .015 x .042 brass strip, with the horizontal leg approximately 18" long and the angled leg approximately 18" long. Using needlenose pliers, bend the bracket into a V-shape until the end of the legs are approximately 12" apart. The bracket is mounted just to the right of the coupler pocket, with the angled bracket end on the car sill lip and the hori zontal bracket end attached directly to the car end. The brake cylinder is mounted on a pad that is placed on top of the coupler pocket and supported with two triangular supports from the coupler assembly. Make a pad from .020 x .156 styrene strip, cut 12" long, and mount on the left side of the coupler assembly. Then make the two triangular styrene b rackets from .030 x .125 styrene strips using a NWSL Choppers 45 angle, removing just a little bit of the angle tip with a razor blade before placing under the pad and securing in place. Trim off the brake rod on the Atlas brake cylinder and drill a #72 hole in the back and front of the brake cylinder and secure to the pad, centered between the two vertical uprights for the brake mechanism on the end ladder assembly. After trimming the mounting pin from
the InterMountain triple valve, determine the orientation of the triple valve per Figure 5 (see Part 1). Drill two rows of two #78 h oles on the front side. Mount the triple valve, with the four holes facing out toward the end of the coupler pocket. Using .015 brass wire, run one piece from the back of the brake cylinder to the lower left hole on the triple valve, two pieces from the air tank to the top two holes of the triple valve, and one from the lower right hole on the triple valve to the train air line. Make a new vertical brake beam from .020 x .060 x 6' 6" long strip styrene and drill two #78 holes, 3 " and 21" from the bottom to attach the brake linkage and brake cylinder. Form a small loop of .015 brass wire and insert through the second hole on the vertical brake beam and feed the wire through the hole on the front of the brake cylinder. Secure the vertical brake beam in place by connecting the brake cylinder wire and attach the brake linkage line through the bottom hole, trimming the brass wire as necessary. The brake beam is mounted horizontally on the prototype and runs from the body to the end ladder assembly, with the top of the angle level just above the brake wheel. Make a new horizontal brake beam from 1/ " angle x 4' 6" long. Attach this horizon16 tal brake beam to the body and the vertical brake beam, making sure it will match the end ladder assembly (see Photos 10-12). Prepare the end ladder assemblies as per the GA-180 car, except the brake-end coupler platform for the GA-191 class does
have the cutout for the brake chain to pass through. The horizontal brake beam mounts t o a small pad on the brake-end ladder assembly, mounted behind and just above the brake mechanism. Install a .030 x .100 x 12" long strip styrene to represent this pad. The GA-191 class cars were built with the rivets on the ladder braces, so these parts were not modified. Install the ladder braces and end ladder assembly on the brake end. Two angles are mounted from the brakecylinder mounting pad toward the end ladder assembly on both sides of the vertical brake beam. Split a 3' 3" long piece of .100 styrene channel in half, creating two angles. Attach with both angles facing away from the vertical brake beam with the top of the angles level, ending just below the end ladder assembly. A trapezoidal-shaped bracket is mounted on the end ladder assembly for the brake chain to run through. Make two pieces from .015 x .100 strip styrene, cut 15" long and trim one corner of both pieces at a 30 angle. Place a 12" long piece .040 x .040 strip inbetween each of these trapezoidal pieces on the long side and glue together. When dry, secure to the bottom of the end ladder assembly and to the front of the angles running from the brake cylinder mounting pads. The bottom of the bracket needs to be flush with the bottom of the coupler pocket. I installed a small piece of chain from the brake mechanism to the vertical brake beam. Insert a small .015 brass wire U-shaped hook t hrough the last chain link. Place the Ushaped hook around the vertical brake beam
GA-191 brake-end detail.
GA-191 brake-end detail. Note hori zontal brake beam and low-mounted brake cylinder. GA-191 brake-end detail. Note the brake cylinder mounting pad.
32 MODEL RAILROADING