Table: railway_locomotives
Columns: locomotive
type
builder
builder_s_no
built
entered_service
withdrawn

Question: What is the Builder of Locomotive 2?
SQL: SELECT "builder" FROM railway_locomotives WHERE "locomotive" = '2'

Question: With a Type of 4-6-4t, what is the sum Withdrawn?
SQL: SELECT SUM("withdrawn") FROM railway_locomotives WHERE "type" = '4-6-4t'