In 1974 LEGO released 5 Trains sets. The largest Trains set from 1974 was
725-2 Freight Train Set with a piece count of 425. The current estimated value of all these Trains sets from this year is about $3,468.53.
LEGO Trains is one of the longer running themes that dates back from 1966 and ran up until 2006. During its run there were multiple sets released running on various power platforms from 4.5volt, to 9 and 12 volt sets. Later in 2011 LEGO released additional train sets using RC and Power Functions controllers under different themes like City.
1974 LEGO Sets
In 1974, LEGO released several new sets and themes, including the LEGO Universal Building Set, which included a range of new bricks in different shapes and colors. 1974 was also the year that LEGO introduced the LEGO Technic theme, which focused on building complex, mechanically-themed models such as cars, airplanes, and construction equipment. The Technic theme introduced new elements such as gears, levers, and motors, which allowed for more realistic, functional models. Other notable sets and themes released by LEGO in 1974 included the LEGO Space theme, which expanded upon the Space sets released in previous years, and the LEGO Trains theme, which introduced the first LEGO electric trains.