Twin-bolster wagons were not rigidly joined together. Here's why:
Twin-bolster wagons are designed to carry long or heavy loads such as steel girders, pipes, or other large items. They feature two bolster frames, each with its own set of wheels and axles. These bolsters are typically connected to a central structure, such as a wagon chassis or a bogie.
The purpose of the twin-bolster design is to provide stability and flexibility while accommodating the length and weight of the load. The bolsters are usually connected to the central structure using pivot points or other articulation mechanisms. This allows the twin-bolster wagons to negotiate curves and uneven track sections more effectively, preventing excessive stress on the wagons and the load.
By incorporating pivot points or articulation mechanisms, twin-bolster wagons can maintain stability and distribute the load evenly across the wheels. This flexibility allows the wagons to adapt to curves and changes in the track alignment, reducing the risk of derailment or damage to the load.
Modelling twin-bolster wagons on a layout can be achieved through various means, such as using articulated bogies, couplings with flexible connections or detailing the pivot points between the bolsters and the central structure.