How to Read
Line and station names are written in accordance with official websites wherever available. Depots are mostly "(place) + Depot", as no official English name is available in most cases.
Status is categorisation based on documents, materials and reasonable estimates, but might contain subjective evaluations. These categories are based on the future prospect of the train, not the number of carriages registered. If there are only small number of trains but still unlikely to be completely withdrawn, they are not endangered. Even if still plenty of trains are in service but due to be replaced soon, the status can be Endangered. See further below for details.
Constructed in means when the train was built. This is based on actual years, not fiscal years.
Number built and Registered are based on the number of carriages, not units. Number built shows how many carriages were introduced in total, including those converted from other type(s) if noted. Registered is the number of carriages that are currently registered for mainline use by railway companies in Japan, including stored ones (which are often referred to as "保留車" or "休車" in Japanese) but excluding some preserved examples.
Definition of Current Status
Least Concern LC
means that no plan or prospect of complete withdrawal at present.
Near Threatened NT
means that gradually declining, or likely to decline soon as part of a replacement plan.
means that likely to be completely withdrawn in a foreseeable future.
means that officially announced or expected to be completely withdrawn within roughly three years.
Critically Endangered CR
means that retirement is imminent.
Data Deficient DD
means there is no enough information. This is applicable to some old trains for tourists, as they could be discontinued suddenly if the owner considers the train difficult to maintain or simply too costly and unprofitable.