Is this LEGO set a good investment?
“As an investment, Diesel Heavy Shunting Locomotive has performed fairly well over the past years in the 4.5V / 12V theme with an overall growth since retirement of around 3343%.”
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Brickset
“From 1980 to 1982, three single locomotives were available. In 1983, they all were replaced by this model. It's a modern styled diesel engine, but without any fancy gadgets. Its design is symmetrical and straightforward, but Lego did not forget to donate some details like... More ladders and lights dummies. Adding the lights kit 7861 is possible, but makes the model look awkward. After a short period of only two years of selling, it vanished without being replaced. It was the last single locomotive until Lego made a new approach in 1991 with set 4551.”
Full review at brickset.com
BrickTrains-Sets
“The Lego 7755 Diesel Heavy Shunting Locomotive is a remake or better yet, and improvement over the 7760: Diesel Shunter Locomotive from 1980. The set includes 164 pieces, 14 more pieces then the 7760, but has less minifigures. Besides having almost identical names, Lego... More totally redesigned this set different from the 7760. First thing you would notice that this set is a red color, not the blue color of the 7760 Diesel Shunter Locomotive.”