Table: steam_locomotives_ir
Columns: type
fleet_numbers
quantity_made
manufacturer
date_made
gswr_class
gswr_nos
gsr_class
inchicore_class
withdrawn

Question: What GSR class is associated with a 0-4-2t type?
SQL: SELECT "gsr_class" FROM steam_locomotives_ir WHERE "type" = '0-4-2t'

Question: Who manufactured fleet numbers of wlwr 2, 4, 11?
SQL: SELECT "manufacturer" FROM steam_locomotives_ir WHERE "fleet_numbers" = 'wlwr 2, 4, 11'