"jkovach"
Also, this poses the question as to whether the proper nomenclature for this type of device is "derail" or "derailer". I've seen both used in various places.
Derail is the nomenclature used in railroad industry documentation and at locations where the devices are installed. The word derailer appears nowhere in my copy of Metrorail Safety Rules and Procedures Handbook dated 09 10 2003, it also appears nowhere in my copy of ATC Glossary of Terms dated 11 24 2003. Here is the definition of derail in the Glossary of Terms:
"DERAIL
A track device to prevent a train from Fouling a main track, derailing (forcing off the track) said train. WMATA’s five Derails are located in the Pocket tracks and are operated by 55E Switch-And-Lock Movements."
My guess is the person or persons charged with installing the sign used 'derailer' because that was the most commonly used description of the device during the reporting of indecent.
John in the sand box of Maryland's eastern shore.