CREATE TABLE table_203_27 (id NUMBER, "number" NUMBER, "serial no" NUMBER, "entered service" CLOB, "withdrawn" CLOB, "kilometres travelled" NUMBER)

only 402,026 kilometres were traveled in what service date ?
SELECT "entered service" FROM table_203_27 WHERE "kilometres travelled" = 402026
SELECT "entered service" FROM "table_203_27" WHERE "kilometres travelled" = 402026