Table: prr_locomotive_specs_3
Columns: prr_class
builder_s_model
build_date
total_produced
wheel_arrangement
service
power_output

Question: What is the wheel arrangement of cf-16-4, and 16 produced?
SQL: SELECT "wheel_arrangement" FROM prr_locomotive_specs_3 WHERE "builder_s_model" = 'cf-16-4' AND "total_produced" = 16

Question: What is the power of b-b wheel arrangement, built in 1952?
SQL: SELECT "power_output" FROM prr_locomotive_specs_3 WHERE "wheel_arrangement" = 'b-b' AND "build_date" = '1952'

Question: When was the build date for c-c wheel arrangement and freight service?
SQL: SELECT "build_date" FROM prr_locomotive_specs_3 WHERE "service" = 'freight' AND "wheel_arrangement" = 'c-c'

Question: When was the build date for ff20 PRR class and erie built builder's model?
SQL: SELECT "build_date" FROM prr_locomotive_specs_3 WHERE "prr_class" = 'ff20' AND "builder_s_model" = 'erie built'