Table: brake_standards_open
Columns: lot_no
diagram
mark
builder
fleet_numbers
notes

Question: Name the most lot number with notes of b4 bogies and diagram of 185
SQL: SELECT MAX("lot_no") FROM brake_standards_open WHERE "notes" = 'b4 bogies' AND "diagram" = 185

Question: Name the fleet numbers for diagram of 186 and lot number of 30798
SQL: SELECT "fleet_numbers" FROM brake_standards_open WHERE "diagram" = 186 AND "lot_no" = 30798