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_5557 ( "Number" real, "Builder" text, "Type" text, "Date" real, "Works number" real )

### Question ###
Which Date has a Builder of alco schenectady, and a Number larger than 835, and Works number of 56566?

### Accurate SQL ###

SELECT AVG("Date") FROM table_5557 WHERE "Builder" = 'alco schenectady' AND "Number" > '835' AND "Works number" = '56566'