LEGO City Flexible and Straight Tracks 7499, 24 Pieces 673419143332 | eBay
Flexible and Straight Tracks : Set 7499-1 | BrickLink
Amazon.com: LEGO City Tracks 60205-20 Pieces Extension Accessory Set, Train Track and Railway Expansion, Compatible with LEGO City Sets, Building Toy for Kids, Great Gift for Train and LEGO City Enthusiasts :
LEGO Set 7499-1 Flexible Rails (2011 City > Trains) | Rebrickable - Build with LEGO