The article fails to mention that the DHR is a UNESCO World Heritage Site - only one of two railways so honored. The DHR has actually tried to replace the Clas

The article fails to mention that the DHR is a UNESCO World Heritage Site - only one of two railways so honored. The DHR has actually tried to replace the Class Bs a few times since they were introduced. The original Class As were too flimsy for the job - and the Garret they ordered after the Class Bs was far too much of a locomotive for them - so the Class Bs remain, 100 years after being introduced. I wonder what if anything I build tech wise will survive 10 years - let alone 10 times that.