Through a Time-Warp
I've mentioned before that one of the reasons why I like to model unusual prototypes is so that I can compare them with more familiar stock. Here's an example:
The Dean 4-2-4T was built around 1881, to explore the idea of a high-speed express tank locomotive for use when the broad gauge became extinct. It failed because of a severe tendency to de-rail, probably from poor bogie design, coupled with the large amount of water sloshing to and fro' in the long side tanks.
In comparison, the Collett 'Large prairie' (Dapol/Airfix kit), of which the prototype was built in 1935 for fast suburban services, has very similar overall length. The side tanks are both shorter and taller, which should help weight distribution and, of course, with six coupled wheels, adhesion is much greater.
I find it interesting to be able to visualise the similarities and differences between these two designs from 75 years apart!
Mike
- 6
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