Table: sr_6pul_info
Columns: units
type
period_used
formed_from
trailers

Question: Name the trailers for formed from pan/pul/res cars
SQL: SELECT "trailers" FROM sr_6pul_info WHERE "formed_from" = 'pan/pul/res cars'

Question: Name the typed for formed from 6-pul trailer third in res unit
SQL: SELECT "type" FROM sr_6pul_info WHERE "formed_from" = '6-pul trailer third in res unit'

Question: Name the formed that has type of 4-cor
SQL: SELECT "formed_from" FROM sr_6pul_info WHERE "type" = '4-cor'