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12V

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12V was a voltage standard for LEGO Trains sets from 1969 until 1993. In contrast to the older battery powered 4.5V standard, the power of the 12V system came from a mains powered DC Transformer delivered by add-on center conductor rails.

In order to reach the newer 12V standard, the older – but still co-existing – 4.5V Trains system could be upgraded by using different 12V Trains accessories.

Beside the train electricity itself, the 12V Trains system was able to power and control many extendable components, such as automated track accessories or lights.

No futher 12V sets were released after 1986, and the 12V powered trains were replaced by 9V trains in 1993.

Leaflet explaining the transition from 12V to 9V made in 1993 (in French)

12V Powered Sets[edit]

Trains[edit]

Trains Accessories[edit]

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Service Packs[edit]



Complete List[edit]

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Image # Set Pieces Figures Price Released
11-Locomotive Traction Tires.jpg 11  Locomotive Traction Tyres       1977 
1104.jpg 1104  Battery Cables         1981 
11-Locomotive Traction Tires.jpg 1111  Rubber Rims for Locomotive Wheels       1977 
12-Wheel Bearings for Locomotives.jpg 1112  Train Sliding Wheel Blocks       1977 
1119 Locomotive Piston Assemblies.jpg 1119  Locomotive Piston Assemblies       1977 
11-Locomotive Traction Tires.jpg 1138  Replacement Rubber Wheel Treads for Trains       1981 
1140-1-911824257.jpg 1140  12V Light Brick       1981 
1146-1-911824485.jpg 1146  4 Pushrods, 2 Cylinder Housings       1981 
1147-1-911823910.jpg 1147  2 Light Prisms, Light Prism Holder, 2 Red and 2 Yellow Light Covers       1981 
1150 Replacement Motor 12V.jpg 1150  Replacement Motor 12V       1977 
12-Wheel Bearings for Locomotives.jpg 12  Wheel Bearings for Locomotives       1977 
12391.jpg 1239  Remote Control for Electric Points         1985 
19-Locomotive Piston Assemblies.jpg 19  Locomotive Piston Assemblies       1977 
26-12V Motor.jpg 26  12V Motor       1977 
5069.JPEG 5069  2 Lighting Bricks 12 V       1987 
5083-1.jpg 5083  Remote Control for Crossing 12V       1989 
5084-1.jpg 5084  Lighting Bricks 12V for Signals       1989 
0703-1.jpg 703  12V Replacement Motor       1969 
0704-1.jpg 704  12V Sleeper (Track) Contacts       1969 
0705-1.jpg 705  Motor Bushings       1970 
0706-1.jpg 706  Rail Contact Wires       1970 
0708-1.jpg 708  2m Extension Cord for Points       1970 
0722-2.jpg 722  12V Electric Train with 2 Wagons  151       1970 
0723-1.jpg 723  Diesel Locomotive  95       1970 
0724-1.jpg 724  12V Diesel Locomotive with Crane Wagon and Tipper Wagon  155       1972 
0725-2.jpg 725  Freight Train Set  425  2 LEGOLAND Minifigures     1974 
0726-1.jpg 726  Western Train  287  3 LEGOLAND Minifigures     1976 
0727-1.jpg 727  Locomotive  134       1977 
0741-1.jpg 741  12V Transformer       1974 
0742-1.jpg 742  12V Transformer - for 100V Mains       1970 
0750-1.jpg 750  Straight Conductor Rails       1969 
0751-1.jpg 751  Curved Conductor Rails       1969 
753 Automatic Right Electric Switch.jpg 753  Automatic Right Electric Switch       1969 
754-Automatic Left Electric Switch.jpg 754  Automatic Left Electric Switch       1969 
0755-1.jpg 755  Left and Right Points  12  None     1974 
756-1.jpg 756  Electric Crossing       1974 
7715-1-1.jpg 7715  Push-Along Passenger Steam Train  449  5   $49.50  1985 
7725 Box.jpg 7725  Electric Passenger Train Set  485  1     1981 
7727-1-1.jpg 7727  Freight Steam Train Set  570  2     1983 
7730-1.jpg 7730  Electric Goods Train Set  512  2     1980 
7735-1.jpg 7735  Freight Train Set  509  2     1985 
7740-1-3.jpg 7740  Inter-City Passenger Train Set  786  10     1980 
7745.jpg 7745  12 Volt High Speed Train  736  10     1985 
7750-1.jpg 7750  Steam Engine with Tender  263  2     1980 
7755-1.jpg 7755  Diesel Heavy Shunting Locomotive  164  1     1983 
7760-1-1.jpg 7760  Diesel Shunter Locomotive  150  2     1980 
7823-1.jpg 7823  Container Crane Depot  487  2   $45.00  1986 
7834-1.jpg 7834  Level Crossing  91  1     1980 
7839-1.jpg 7839  Car Transport Depot  340  2   $39.00  1986 
7850-1.jpg 7850  Straight Rails  32     $$9.25  1980 
7851-1.jpg 7851  Curved Rails  32     $9.25  1980 
7854-1.jpg 7854  Straight Electric Rails       1980 
7855-1.jpg 7855  Curved Electric Rails       1980 
7856-1.jpg 7856  Electric Points  16       1980 
7857-1.jpg 7857  Electric Crossing     $8.75  1980 
7858-1.jpg 7858  Remote Controlled Points Right 12V  12       1980 
7859-1.jpg 7859  Remote Controlled Points Left 12V  12       1980 
7860-1.jpg 7860  Remote Controlled Signal  24       1980 
7861-1.jpg 7861  Lighting Set Electric 12V  28       1980 
7862 Box.jpg 7862  Remote Controlled Decoupling  16       1981 
7863-1.jpg 7863  Remote Controlled Point Motor 12V       1980 
7864-1.jpg 7864  Transformer / Speed Controller 12V  33       1980 
7865-1.jpg 7865  Motor Replacement Unit for Battery or Motor-Less Trains 12V  19       1980 
7866-1-2.jpg 7866  Remote Controlled Road Crossing 12V  191  1     1983 
7867 Box.jpg 7867  4 Lighting Standards Electric 12V  52       1983 
Facts about "12V"