JR East took delivery of another HB-E300 trainset, intended for service as the Resort Shirakami Buna. Currently there is a modified KIHA40 formation with this name.
This left J-Trec as a 3-car set:
Car 1, HB-E301-5
Car 2, HB-E300-105
Car 4, HB-E302-5
Obviously car 3 is missing; its body will...