He also introduced diesel power in the form of streamlined rail cars in 1934 .
Next came Charles Collett in 1921 ; he standardised the many types of locomotives then in service , producing the iconic Castle and Kings .
Charles Collett also introduced diesel power in the form of streamlined rail cars in 1934 .
Next came Charles Collett in 1921 ; he standardised the many types of locomotives then in service , producing the iconic Castle and Kings .