This is where we begin to see the need for steam locomotive boiler construction rules.
At the request of the locomotive boiler industry, BPV I formed the Subgroup on Locomotive Boilers on February 10,2010.
Steam locomotive boilers have not been built in the United States since 1952.
It was felt by all that any steam locomotive boilers could be built in accordance with the current Section I, Rules for Construction of Power Boilers, and that is where matters have stood until 2015.
One of the curious things about locomotive boilers is that they work at all, especially the bigger ones.
That change was a very bad idea for steam locomotive boilers simply because the feature, known as a telltale, is the best indicator of when the staybolt breaks.
Some may wonder why a modern code would address locomotive boiler technology, which could be considered an arcane art.
This new edition of Section I marks the first time in more than 60 years that ASME has published a stand-alone code addressing requirements for locomotive boilers.
Millions of people throughout the world ride behind and stand near steam locomotive boilers every year.
Since the late 1950s there has been a growing knowledge base on locomotive boilers in preservation railroad circles, but it has been outside the mainstream boiler industry.
In an attempt to rectify this situation, the ASME Subgroup on Locomotive Boilers has taken the approach of codifying both best practices and Code material from the early steam days of the locomotive, melding modern technology into the process where that technology has been tested and proven.
The result of the Subgroup's efforts, Part PL, Requirements for Locomotive Boilers, was included in the 2015 Edition of BPVC Section I, Rules for Construction of Power Boilers, which was published on July 1.