FULL POWER + TONES! 201001 Hastings unit "thumper" passes Peckham Rye 

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The British Rail Class 201 (or 6S) six-car diesel-electric multiple units (DEMUs) were built in 1957-1958 at Eastleigh and underframes were built at Ashford.
The Southern Region Class 201-207 DEMUs are nicknamed 'Thumpers' due to the noise they made while in motion, owing to the four cylinder engines.
These units were built for the London-Hastings line, with a narrow body profile to accommodate the restricted tunnel loading gauge on that line.