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Metrolink head-on crash in Chatsworth
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[QUOTE]Originally posted by Geoff M: [QB] [QUOTE]Originally posted by George Harris: [qb]Three people that should know what they were looking at say they saw the signal and it was green. [/qb][/QUOTE]According to reports here and elsewhere, the last two signals were not called out. There is a signal at CP DeSoto, an intermediate one before Chatsworth, and the end-of-siding one at CP Topanga. The one at CP DeSoto apparently shows flashing yellow if the Topanga signal is red; the intermediate one showing steady yellow. This makes sense with the linespeeds and stopping distances quoted. Have there been any reports of whether or what aspect was called for the DeSoto signal? If it was called as green then the Metrolink had some sort of proceed aspect at Topanga; if it was called as flashing yellow then he didn't. If the Topanga signal was showing a false proceed aspect then it doesn't matter what the data loggers in the interlocking show, as they only report what they commanded the signal to do, not what it actually did. Depending on the installation, one loose wire between the interlocking and the lamps themselves could be all it needs to false-feed the DR (green) aspect. This is what happened at Clapham (UK, late 1980s) which resulted in all new installations needing double-cutting of relays to help prevent stray wires false-feeding vital contacts. Geoff M. [/QB][/QUOTE]
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