Well this one of the cars that the site is dedicated too
.The Austin J40 was produced in a
variety of colours.
The running gear was always black with the seat being painted "fan
blade" yellow.
Unlike the Pathfinder it had electrics, a working horn and lights. These were powered by 2 Ever Ready 4.5 volt batteries wired in series. To confuse everyone all the wiring was the same colour - pink
Spark plugs on most of the cars were screw in Champion N5.
As the history page tells you it had some fore runners until the design was settled on.
In production terms the Pathfinder came first but only for a very short time. The J40 took over and lasted around 20 years, giving fun to small and big kids (known as adults). Plus the objective of giving work to disabled miners was also realised.
These are copies of the original drawings made for the J40
(Click on either of the drawings to see a larger version)
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The original J40 was drawn as a bolt together car, allegedly one or two of these examples are still around. The mass produced version were all welded together.
The actual specification of the J40 was printed in the
sales brochure 
as
DIMENSIONS & WEIGHTS:
LENGTH: 5 ft. 3 in. (1.60m.)
WIDTH: 2 ft. 3-1/2 in. (.69m.)
HEIGHT: 1 ft. 10 in. (.56m.)
WEIGHT: 95 lbs. (43 kgs.)
