A number of the class were modified to transport kaiten.

A small number were modified by the few custom coach builders left in the United States before the war.

Large numbers of war surplus R1155 radios were modified for private use postwar.

A number was modified and served with the Israeli Army.

A number of controversial projects eventually were cancelled or modified.

A number of the class were modified for use as yard shunters.

A number of musical sequences have been modified from their purpose in the film.

When standard nationwide numbering was introduced, numbers were modified again.

In some cases revised numbers were later modified again, raising concerns among investors and analysts about how much to trust the figures being reported.

Certain numbers of Mk.1 were modified latter in the war and designated Mk.1*.