B-131018-1058-847-Leamland-Br-Horsted-Keynes
SR S15 #847 departing Horsted Keynes. Despite it is in October, 13th was quite warm day and the temperature was reaching over 20 degrees Celsius. I do not know if this is the cause or not but I could hardly see any significant exhaust although the noise was horrendous. This is only my shot today that captured the nice exhaust from S15.