The fleet number of the tram on the left is clearly 1.
• • •
Парковый номер вагона слева четко виден как номер 1.

Quote (Ymtram, 04.06.2024):
> The fleet number of the tram on the left is clearly 1.

And wrong. 3 numbers are missing, or stolen, or whatever...

Цитата (focus1965, 04.06.2024):
> 3 numbers are missing, or stolen, or whatever...

I agree that the number 1 is probably wrong, and there is another official fleet number exists. However, I felt such numbering might had been preserved intentionally for marketing / promotional consideration, e.g. to emphasize this is 'the first tram ever' etc. It would be curios to see if the number '1' will be retained for the opening ceremonies.

> 3 номера отвалились, или украдены, или что там еще...

Согласен, что цифра 1, вероятно, неправильная, и существует другой официальный номер вагона. Однако, я подозреваю, что такой номер мог быть присвоен намеренно для маркетинговых / рекламных соображений, например, чтобы подчеркнуть, что это именно "первый трамвай сети" и т.п. Было бы интересно посмотреть, сохранится ли номер "1" к церемонии открытия сети.

Quote (Ymtram, 05.06.2024):
> I agree that the number 1 is probably wrong, and there is another official fleet number exists. However, I felt such numbering might had been preserved intentionally for marketing / promotional consideration, e.g. to emphasize this is 'the first tram ever' etc. It would be curios to see if the number '1' will be retained for the opening ceremonies.

The tram was delivered with the complete number.
You can check all the press releases (letram.be): no mention about the first tram (as 1). Let's see if this tram will run on tests or by the opening with this number. BTW: I don't think you could see every side (incl. inside) of this tram.

I found in a magazine a photo of this tram (on a test run) with remark "1 aka 5101". I merge both profiles.

Цитата (focus1965, 22.06.2024):
> "1 aka 5101"

This was exactly my suspicion, especially since 5101 is the very first number in the fleet (but curiously not the first tram that was delivered). Let's see if the number '1' will be used for presentation purposes through the opening ceremonies.

What is known about 5102-5106? The fleet roster is incomplete.

Quote (Ymtram, 22.06.2024):
> What is known about 5102-5106? The fleet roster is incomplete.

The problem in Liège is exactly the same as in Antwerp. Not coincidentally: the trams come from the same factory.
They are delivered randomly and therefore not in numerical order.
Moreover, in Antwerp, deliveries take place during the night.
In the beginning (with the first ones), there are still local enthusiasts who are present, but afterwards the interest gradually fades.
Official data doesn't exist, or is not shared, or simply kept secret.
For both Antwerp and Liège, one can reasonably assume that all, or most of the trams, have been delivered, but precisely this difference makes it impossible to keep the database correctly updated without guessing.