In 2005, LEGO released 2 Trains sets in the subtheme 9 V, all of these sets have been retired. For that year, the total price of all retail sets cost $80, today those sets are valued around $804, a growth of 905%.
Most valuable 2005 LEGO Trains set
10133 Burlington Northern Santa Fe BNSF Locomotive $553.79
2 sets

10133 Burlington Northern Santa Fe BNSF Locomotive

Theme / Subtheme Trains / 9V
Year 2005
Pieces / Minifigs 407 / 2
Availability Retired
10133 LEGO Trains Burlington Northern Santa Fe BNSF Locomotive
Retail $39.99
Value $553.79
Growth  +1284.8%
Annual growth 7.3%

10170 TTX Intermodal Double-Stack Car

Theme / Subtheme Trains / 9V
Year 2005
Pieces 366
Availability Retired
10170 LEGO Trains TTX Intermodal Double-Stack Car
Retail $39.99
Value $249.97
Growth  +525.1%
Annual growth 6.5%