Question:
Which employer did Dugald Drummond work for in May, 1889?

Context:
 Dugald Drummond works for Edinburgh and Glasgow Railway from Jan, 1864 to Jan, 1864. 
 Dugald Drummond works for North British Railway from Jan, 1875 to Jan, 1882. 
 Dugald Drummond works for London, Brighton and South Coast Railway from Jan, 1870 to Jan, 1875. 
 Dugald Drummond works for Caledonian Railway from Jan, 1882 to Jan, 1890.

Answer:
Question:
Which employer did Dugald Drummond work for in May, 1889?

Context:
 Dugald Drummond works for Edinburgh and Glasgow Railway from Jan, 1864 to Jan, 1864. 
 Dugald Drummond works for North British Railway from Jan, 1875 to Jan, 1882. 
 Dugald Drummond works for London, Brighton and South Coast Railway from Jan, 1870 to Jan, 1875. 
 Dugald Drummond works for Caledonian Railway from Jan, 1882 to Jan, 1890.

Answer:
user
Caledonian Railway
assistant
Question:
Which employer did Dugald Drummond work for in May, 1889?

Context:
 Dugald Drummond works for Edinburgh and Glasgow Railway from Jan, 1864 to Jan, 1864. 
 Dugald Drummond works for North British Railway from Jan, 1875 to Jan, 1882. 
 Dugald Drummond works for London, Brighton and South Coast Railway from Jan, 1870 to Jan, 1875. 
 Dugald Drummond works for Caledonian Railway from Jan, 1882 to Jan, 1890.

Answer:
user
North British Railway
Edinburgh and Glasgow Railway
London, Brighton and South Coast Railway
assistant
Question:
Which employer did Dugald Drummond work for in May, 1889?

Context:
 Dugald Drummond works for Edinburgh and Glasgow Railway from Jan, 1864 to Jan, 1864. 
 Dugald Drummond works for North British Railway from Jan, 1875 to Jan, 1882. 
 Dugald Drummond works for London, Brighton and South Coast Railway from Jan, 1870 to Jan, 1875. 
 Dugald Drummond works for Caledonian Railway from Jan, 1882 to Jan, 1890.

Answer:
user
Caledonian Railway
assistant