Silver Train

"Silver Train" is a reference to the Texas rock singer Johnny Winter, who was an albino. Winter heard an early take and released his own version in March 1973, a few months ahead of The Stones.

Mick Jagger blew the train whistle.

This was driven by the piano of Ian Stewart, who was not a member of the band because their manager felt he did not fit the image. Stewart was known as "The 6th Stone."