This is the first series of USI cars designed by LS Models in collaboration with Heris, references 14001 to 14034. The improvements should also apply to Belgian K4 cars, which are USIs sold to SNCB, then rented for some time to NS (Dutch Railways) ref. LSM 12003-4, 12131-12134.

The defects

Molded handles and cables are stunted. The bogies whose axis is offset to facilitate running in curves and which have no rotation stop easily place themselves perpendicular. Annoying. The inner windows of the compartments (for the 1st class car) have very visible clearance angles, i. e. the sides that are supposed to be vertical are oblique — see the pictures below.

The body is too low (43.8 mm instead of 44.5) and the bogie center distance is too short by 7 mm! The cantilever of the actual cars is quite important — but not more than that of “long” DEV cars — here it becomes caricature. And, at the same time, the body openings above the bogies are strongly elongated towards the middle of the car.

It is possible to correct the defect of the center distance, provided that we accept to slightly trim the bogie beams, which come to bump into the steps. For once, here is, before starting, the result of this operation, to show you that the sacrifice is not so terrible.

Comparison before / after center distance modification

LS Models-Heris USI cars A4t4 ref. 14016 and 14011-I.

Top, unmodified car, bottom, modified car. It can be seen that in alignment, the reduction of the beams is almost invisible.

On the other hand, the height has been slightly increased, which shows a space between the body and the secondary suspension consoles. These consoles are in fact fixed on the bogie, whereas they should be fixed on the body. This “cheating” could be understood to facilitate the movement of the bogie with the eccentric pivot. As the pivot is brought closer to the center, we can try to fix the consoles on the body.

In summary, the following operations are envisaged: