In 2011, LEGO released 2 City Trains sets, all of these sets have been retired. For that year, the total price of all retail sets cost $180, today those sets are valued around $445, a growth of 147%.
Most valuable 2011 LEGO City Trains set
3677 Red Cargo Train $411.82
Most owned 2011 City Trains set
7499 Flexible and Straight Tracks
2 sets

3677 Red Cargo Train

Theme / Subtheme City / Trains
Year 2011
Pieces / Minifigs 831 / 4
Availability Retired
3677 LEGO City Red Cargo Train
Retail $159.99
Value $411.82
Growth  +157.4%
Annual growth 5.4%

7499 Flexible and Straight Tracks

Theme / Subtheme City / Trains
Year 2011
Pieces 24
Availability Retired
7499 LEGO City Flexible and Straight Tracks
Retail $19.99
Value $32.71
Growth  +63.6%
Annual growth 6.3%