Those are some great suggestions, thanks both! Interestingly, I've
worked with Gai-Tronics emergency intercoms before, never occurred to
see if they manufacture anything along those lines.
We'll probably need in the region of half a dozen, so I'll keep an eye
out on eBay and Facebook over the next few months. While the phones
will be useful for communicating quickly, a train whistle is still by
far the easiest way of attracting attention for anything safety
critical, given the effective range of a few miles.
We currently have what's probably best described as an antique PBX.
It's entirely mechanical, consisting of a number of relays and what I
believe to be four Strowger switches. The unit doesn't seem to have
any identifying markings, but does feature a rather nice diagram on
the inside. From what I can tell, it supports 16 lines (albit with
rather odd numbering), though only two simultaneous calls. Given the
lack of rotary dials on the SPTs, it's likely we'd need some separate
system to handle the automatic dialling, possibly with some
connectivity to the existing PBX. I have a feeling something like a
Grandstream HT818 would do the trick nicely.
The railway in question is the East Herts Miniature Railway -
https://ehmr.org.uk/
Regards,
Sam Mansfield
www.foxocube.xyz
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