Task: Question Generation
Input (English): Context : The LD&ECR Class D was a class of nine 0-6-4T steam locomotives supplied to the Lancashire, Derbyshire and East Coast Railway in 1904 and 1906 by Kitson & Co. of Leeds. 
Subject : LD&ECR Class D 
Relation : service entry
Output (English): What was the year LD&ECR Class D entered service?