LEGO 742 12v Transformer was a Trains set released in 1970. It is also called "12V Transformer - for 100V Mains".

Sets in Trains / 12V

Theme / Subtheme Trains / 12V
Year 1969
Pieces 369
Availability Retired
720-2 LEGO Train with 12V Electric Motor
Retail $24.50
Value $774.78
Growth 3062.4%
Annual growth 6.6%
Theme / Subtheme Trains / 12V
Year 1970
Pieces 151
Availability Retired
722-2 LEGO 12V Electric Train with 2 Wagons
Retail $15.25
Value $975.77
Growth 6298.5%
Annual growth 8.2%
Theme / Subtheme Trains / 12V
Year 1969
Pieces 126
Availability Retired
721 LEGO Trains Steam Locomotive
Retail $11.50
Value $509.68
Growth 4332.0%
Annual growth 7.4%
Theme / Subtheme Trains / 12V
Year 1970
Pieces 95
Availability Retired
723 LEGO Trains Diesel Locomotive
Retail $8.50
Value $563.28
Growth 6526.8%
Annual growth 8.2%
Theme / Subtheme Trains / 12V
Year 1969
Pieces 28
Availability Retired
702 LEGO Trains 12V Motor with Accessories Pack
Retail $7.25
Value $359.99
Growth 4865.4%
Annual growth 7.7%
Theme / Subtheme Trains / 12V
Year 1969
Pieces 8
Availability Retired
750 LEGO Trains 8 Straight 12V Conducting Rails
Retail $1.49
Value $17.78
Growth 1093.3%
Annual growth 4.0%
Theme / Subtheme Trains / 12V
Year 1969
Pieces 8
Availability Retired
751 LEGO Trains 8 Curved 12V Conducting Rails
Retail $1.49
Value $9.41
Growth 531.5%
Annual growth 4.4%
Theme / Subtheme Trains / 12V
Year 1969
Pieces 5
Availability Retired
753 LEGO Trains Automatic Right Electric Switch
Retail $4.75
Value $177.11
Growth 3628.6%
Annual growth 6.9%
Theme / Subtheme Trains / 12V
Year 1969
Pieces 5
Availability Retired
754 LEGO Trains Automatic Left Electric Switch
Retail $4.75
Value $177.11
Growth 3628.6%
Annual growth 6.9%
Theme / Subtheme Trains / 12V
Year 1969
Pieces 4
Availability Retired
705 LEGO Trains Motor Bushings
Retail $0.50
Value $6.83
Growth 1266.0%
Annual growth 2.9%
Theme / Subtheme Trains / 12V
Year 1969
Pieces 2
Availability Retired
704 LEGO Trains 12V Sleeper Track Contacts
Retail $0.75
Value $54.83
Growth 7210.7%
Annual growth 7.7%
Theme / Subtheme Trains / 12V
Year 1969
Pieces 1
Availability Retired
703 LEGO Trains 12V Replacement Motor
Retail $2.25
Value $33.17
Growth 1374.2%
Annual growth 5.1%
Theme / Subtheme Trains / 12V
Year 1969
Pieces 1
Availability Retired
706 LEGO Trains Rail Contact Wires
Retail $0.75
Value $24.64
Growth 3185.3%
Annual growth 3.7%
Theme / Subtheme Trains / 12V
Year 1970
Pieces 1
Availability Retired
708 LEGO Trains 2m Extension Cord for Points
Retail $1.00
Value $14.34
Growth 1334.0%
Annual growth 5.2%
Theme / Subtheme Trains / 12V
Year 1969
Pieces 1
Availability Retired
740-2 LEGO Trains 12V Transformer for 220V Pack
Retail $12.50
Value $63.55
Growth 408.4%
Annual growth 3.1%
Theme / Subtheme Trains / 12V
Year 1969
Availability Retired
707-2 LEGO 12V Train Replacement Parts Retailer Pack