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GraviTrax construction sets use STEM-friendly concepts while building critical thinking and problem-solving skills
while keeping braking at full power for inexperienced drivers
Love them or hate them
Black railroad ties
Clear light parts and fine PE parts are included
Silver Series GP40 Locomotive Union Pacific #503 Chemistry_NiMH GraviTrax construction sets use STEM-friendlyDetails: In 1966 EMD introduced a new line of locomotives based on the 16 cylinder 645 series prime mover. The "40 series" included a six axle and four axle model, the latter being the GP40. A total of 1,145 units were produced between 1966 and 1972. These turbocharged 3,000hp locomotives were used primarily in road freight service. The GP40 was a versatile locomotive that could be found across the US hauling drag freights over mountain passes and
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