Definitions

1. verb

to get off or leave a train, especially to continue by road or on foot

“The passengers detrain at the station to catch a bus to their hotel.”

2. verb

to remove or detach something from a train, especially a car or a piece of equipment

“The engineer had to detrain the faulty carriage from the rest of the train.”

3. noun

the act of getting off or leaving a train

“The detrainment was a chaotic scene as hundreds of passengers rushed to get off the train.”