Definition: Generate a question which can yield the answer mentioned in the input. Generated question must be answered by the answer provided in input, without using any extra knowledge.
Input: Context : The DRG Class 99.19 engines were metre gauge, ten-coupled, superheated, steam locomotives that were employed in the southwestern German state of Wurttemberg from 1927.
Answer : 1927
Output:
What year was DRG Class 99.19 introduced?