Jerry -
The "Q" used clasp-type brakes with cast iron brake shoes (two per wheel) on
all their diesels. Your model should have six 8"x 8" brake cylinders per
truck. They were really good engine brakes that operated on 45 psi air
pressure, unlike the single (composition) brake shoe per wheel post-merger
units that operated on 72 psi air pressure. The 516-530 were delivered early
in 1969 three years after the GN got the first production SD-45 #400 "Hustle
Muscle" in 1966. I believe the BN received the last SD-45 built, 6567 in
1971. They were my all-time favorite engine to run.
Bob Campbell
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