In 1970, LEGO released 5 Trains sets across 2 subthemes, all of these sets have been retired. Subthemes for that year included 12V and 45V. For that year, the total price of all retail sets cost $37, today those sets are valued around $1,714.
Most valuable 1970 LEGO Trains set
722-2 12V Electric Train with 2 Wagons $1,088.85
Most owned 1970 Trains set
723 Diesel Locomotive
Theme / Subtheme Trains / 4.5V
Year 1970
Pieces 1
Availability Retired
104 LEGO Trains 4.5V Replacement Motor
Retail $2.50
Value $41.38
Growth  +1555.2%
Annual growth 5.3%
Theme / Subtheme Trains / 12V
Year 1970
Pieces 1
Availability Retired
708 LEGO Trains 2m Extension Cord for Points
Retail $1.00
Value $20.37
Growth  +1937.0%
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 $1,088.85
Growth  +7040.0%
Annual growth 4.1%
Theme / Subtheme Trains / 12V
Year 1970
Pieces 95
Availability Retired
723 LEGO Trains Diesel Locomotive
Retail $8.50
Value $563.44
Growth  +6528.7%
Annual growth 6.7%
Theme / Subtheme Trains / 12V
Year 1970
Pieces 1
Availability Retired
742 LEGO Trains 12v Transformer
Retail $9.99