Thread:TheRealPella/@comment-26692787-20160309014410/@comment-15636815-20160309070309

Process complete.
 * ED250 Express I renamed to ED250 Express I (2014).
 * Edited ED250 Express I (2014) to add about and to specify infobox title without disambiguation modifier.
 * Edited ED250 Express I (redirect page) to point to ED250 Express I (disambiguation).
 * ED250 Express II renamed to ED250 Express II (2014).
 * Edited ED250 Express II (2014) to add about and to specify infobox title without disambiguation modifier.
 * Edited ED250 Express II (redirect page) to point to ED250 Express II (disambiguation).
 * Created new set page ED250 Express I (2016). (In this case, renamed ED250-Express I without leaving a redirect.)
 * Added about above trainset.
 * Created new set page ED250 Express II (2016). (In this case, renamed ED250-Express II without leaving a redirect.)
 * Added about above trainset.
 * Created ED250 Express I (disambiguation) to help users find the desired set.
 * Created ED250 Express II (disambiguation) to help users find the desired set.
 * Edited all article pages for locomotives and wagons in all four sets to update set page names, with disambiguation modifiers displayed.

Yes, it's a bit complicated.

Yes, it takes some time to do it right.

No, users won't complain that they're confused or that they can't find what they're seeking. Proper disambiguation eliminates these problems before they become problems. ;-)