Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE table_38453 ( "Line" text, "Speed" text, "Length" text, "Construction begun" text, "Expected start of revenue services" real )

### Question ###
What is the Speed when Construction begun in 2010, and an Expected start of revenue services of 2015?

### Accurate SQL ###

SELECT "Speed" FROM table_38453 WHERE "Construction begun" = '2010' AND "Expected start of revenue services" = '2015'