Howdy Super!
The set you've got looks to be a formerly standard release in the Plarail Shops in Japan! Some of the bullet trains that are released in a pack giving them those four coaches with the motorized engine and tail engine without any track; however, the one you have is one that was released with some track as an add-on accessory including a full train. Most of the reason why the price goes sky-high for this set is because that engine and its consist are heavily rare to find like that, being a six car train and all; most of the time, the train is retailed like sunhuntin's three car consist.
The set you've got looks to be a formerly standard release in the Plarail Shops in Japan! Some of the bullet trains that are released in a pack giving them those four coaches with the motorized engine and tail engine without any track; however, the one you have is one that was released with some track as an add-on accessory including a full train. Most of the reason why the price goes sky-high for this set is because that engine and its consist are heavily rare to find like that, being a six car train and all; most of the time, the train is retailed like sunhuntin's three car consist.
Residential train-afficionado in training, and Thomas & Friends fan.