| It is probably impossible to tell to difference between these designs without a good side-on view like the U4 below. The U3 has either a left or right 'middle' panel that is slightly narrower than the other 2 'middle' panels. Both the U4 and U5 are symmetrical and can only be distinguished if you can read the carriage number. | |||
| Composite diagram U3 | 26' long 4 wheel |
Compartments: 2nd, 2nd, 1st, 2nd | |
| Composite diagram U4 | 26'10" long 4 wheel |
Compartments: 2nd, 1st, 1st, 2nd | A U4 in departmental use.
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| Composite diagram U5 | 27'6" long 4 wheel |
Compartments: 2nd, 1st, 1st, 2nd | |
