http://glostransporthistory.visit-gloucestershire.co.uk/railwayraptors.htm THE RAILWAY RAPTORS] section HS4000 KESTREL glostransporthistory.visit-gloucestershire.co.uk Brush Electric Engineering Ltd. (Brush Traction) in association with Sulzer Brothers Ltd. responded with a 4000 horsepower locomotive for British Rail's appraisal.