[LEAPSECS] No leapseconds on trains

Rob Seaman seaman at noao.edu
Thu Nov 17 13:53:01 EST 2011

On Nov 17, 2011, at 11:21 AM, Poul-Henning Kamp wrote:

> No, that means that all trains built in the last approx 10 years, are

> built without handling for leap seconds.

Train systems are bigger than this one standard. Other aspects of their logistics will exhibit different timekeeping behavior. Assuming that redefining UTC is a panacea (a Procrustean justification if ever there was one) is not a coherent engineering plan.

> For further reading, I can recommend the ERTMS(2) family of standards,

And is that where they say that it will cost more than this:


to perform a recertification that nobody has demonstrated is necessary? And do they provide a risk assessment that redefining UTC to no longer provide Universal Time can and will have no effects whatsoever, even regarding interoperability with such things as container ships and airlines?

If you don't want a sermon, don't make blanket claims with no supporting engineering. BTW, are your slides from the USNO presentation online?


More information about the LEAPSECS mailing list