In 1970, LEGO released 4 Trains 12V sets, all of these sets have been retired. For that year, the total price of all retail sets cost $35, today those sets are valued around $1,645.
Most valuable 1970 LEGO Trains 12V set
722-2 12V Electric Train with 2 Wagons $1,078.67
Most owned 1970 Trains 12V set
723 Diesel Locomotive
Theme / Subtheme Trains / 12V
Year 1970
Pieces 1
Availability Retired
708 LEGO Trains 2m Extension Cord for Points
Retail $1.00
Value $20.24
Growth  1924.0%
Annual growth 5.7%
Theme / Subtheme Trains / 12V
Year 1970
Pieces 151
Availability Retired
722-2 LEGO 12V Electric Train with 2 Wagons
Retail $15.25
Value $1,078.67
Growth  6973.2%
Annual growth 4.1%
Theme / Subtheme Trains / 12V
Year 1970
Pieces 95
Availability Retired
723 LEGO Trains Diesel Locomotive
Retail $8.50
Value $545.76
Growth  6320.7%
Annual growth 6.8%
Theme / Subtheme Trains / 12V
Year 1970
Pieces 1
Availability Retired
742 LEGO Trains 12v Transformer
Retail $9.99