There is no refrigeration equipment in the train car where the ice cream is kept, so
dry ice is used as a
refrigerant in in-car sales to maintain the quality of the ice cream. Sometimes the lid cannot be removed.
Workarounds The manufacturer, Sujahta, explains that one needs to wait 10 minutes before eating it. If purchased at train station kiosks where commercial freezers are available, they can be purchased in an easy-to-eat condition. Consumers have experimented with various measures and posting them on social networking sites. One method that has been devised is "sticking a stick into an ice cream and pulling it straight out of the cup to eat it like an ice cream stick". Some people have tried pouring hot coffee over it to make an
affogato, but according to reports, this did not work as the coffee froze on top instead of melting the ice cream.
Dedicated spoon design The sale of metal spoons suitable for this ice cream had long been considered, but at the time, pre-washed metal spoons were not available and were not suitable for in-car sales, where they are supposed to be used immediately on the spot. However, in 2020, metal spoons pre-cleaned with pure water became available for the Shinkansen. In 2014, the
Shinkansen N700S Ice Cream Spoon, made of
aluminum with high
thermal conductivity, was launched. When it was first released, it sold out in just three days. Subsequently, variations were made that were not originally planned, and one variant featuring
Doctor Yellow was re-released in 2022 after initially being released in 2021. == Internet slang ==