Your favorite train. Only requirement is your reason, and a bit of information of the train.

Pic related, Litra MY (Class). A Danish locomotive finalized in 1954. It's a diesel-electric powered unit, that has proven so reliable, that several engines is still operating when needed, such as last minute maintenance, snow-plowing and occasionally freight. A few was surplus to the Germans in the late '90s for the same usage as well.