CREATE TABLE table_54317 ("PRR Class" CLOB, "Builderpars_m_singles Model" CLOB, "Build date" CLOB, "Total produced" FLOAT, "Wheel arrangement" CLOB, "Service" CLOB, "Power output" CLOB)

What is the build date of the model with a PRR Class of brs24?
SELECT "Build date" FROM table_54317 WHERE "PRR Class" = 'brs24'
SELECT "Build date" FROM "table_54317" WHERE "PRR Class" = 'brs24'