Table:
text: British Rail Class 421
Fleet details
Fleet details
Class_ Type_ No_built_Converted_ Year_built_Converted_ No_range Withdrawn
Class 420 4Big 18 1965-66 7031-7048 1986
Class 420 4Big 10 1970 7049-7058 1988
Class 421 4Cig 36 1963-66 7301-7336 (later 1101-1136) 1993
Class 421 4Cig 102 1970-74 7337-7438 (later 1201-1300) 1993
Class 421 8Mig 2* 1983* 2601–2602 1983

Question: Can you tell me the number range for the British Rail Class 421 in 1965-66?

Question: Tell me the year of manufacture 1983 for the British Rail Class 421. ?

Question: Can you tell me the year of construction for the number built from 10 for the British Rail Class 421?