Table: london_underground_stock
Columns: year
builder
motors
trailers
control_trailers

Question: Tell me the control trailers for 52 motors
SQL: SELECT "control_trailers" FROM london_underground_stock WHERE "motors" = '52'

Question: Name the year for mcwf and control trailers of 35
SQL: SELECT "year" FROM london_underground_stock WHERE "builder" = 'mcwf' AND "control_trailers" = '35'

Question: I want the trailers for 1931 and builder of mccw
SQL: SELECT "trailers" FROM london_underground_stock WHERE "year" = '1931' AND "builder" = 'mccw'

Question: I want the control trailers for 1931 with builder of grcw
SQL: SELECT "control_trailers" FROM london_underground_stock WHERE "year" = '1931' AND "builder" = 'grcw'

Question: I want the trailers for motors of 145
SQL: SELECT "trailers" FROM london_underground_stock WHERE "motors" = '145'