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Two-aspect signal at danger (stop) in the United Kingdom
A signal passed at danger (SPAD), known in the United States as a stop signal overrun (SSO)[1] and in Canada as passing a stop signal,[2]: 75 is an event on a railway where a train passes a stop signal without authority.[3] This is also known as running a red.[4]
The name derives from red colour light signals and horizontal semaphore signals in the United Kingdom, which are said to be at danger when they indicate that trains must stop (also known as the signal being on). This terminology is not used in North America where not all red signals indicate stop.[2]: 72 In the UK, a signal passed at red (SPAR) is used where a signal changes to red directly in front of a train, due to a fault or emergency, meaning it is impossible to stop before the signal.
^Multer, Jordan; Safar, Hadar; Roth, Emilie; France, Megan (June 2019). Why do Passenger Trains Pass Stop Signals – A Systems View (PDF) (Report). Washington, DC: Federal Railroad Administration. DOT/FRA/ORD-19/19. Archived (PDF) from the original on 18 May 2021. Retrieved 18 May 2021.
^ ab"Canadian Rail Operating Rules" (PDF). Transport Canada. 24 April 2020. Retrieved 18 May 2021.
^"Signals Passed at Danger". ORR.gov.uk. Office of Rail and Road. Retrieved 12 May 2018.
^Hersman, Deborah. "Texting: Tomorrow's Unacceptable Behavior". National Transportation Safety Board. Archived from the original on 15 February 2017. Retrieved 11 September 2016.
and 27 Related for: Signal passed at danger information
(1955). Red for Danger. John Lane the Bodley Head Ltd. pp. 40, 41. ISBN 9780752451060. "Accident Returns: Extract for Accident at Dixenfold on 4th March...
October 1999 at Ladbroke Grove in London, England, when two passenger trains collided almost head-on after one of them had passed a signalatdanger. With 31...
line immediately ahead is clear or not. A stop signal must not be passed in the horizontal "on" (danger) position, except where specially authorised by...
There have been four railway accidents at Potters Bar (England). Those in 1898 and 1946 were signalspassedatdanger. The accident in 2002 led to substantial...
a red signal. The Onotani Signal Station (小野谷信号場, Onotani Shingōjō) was the only point on the single-track line where two trains can safely pass, but the...
to stop at Dalehurst. The crash investigation found that the freight train was traveling at 59 mph (95 km/h) as it passed the approach signal—9 mph (14 km/h)...
report noted that the signal had a high incidence of being passedatdanger – four drivers had previously passed the signal when atdanger in the previous five...
of decline in recent years.[citation needed] Signalpassedatdanger Rule 55 Pass of Brander stone signals Semaphore line Dendy Marshall, C.F., revised...
moments, began to accelerate. It passed the Starting signal which, as far as the signalman could see, was still atDanger. He went down onto the track and...
adviser (UK), a government post Self-propelled air defence, weapons Signalpassedatdanger by a train Suruhanjaya Pengangkutan Awam Darat, the Land Public...
travelling at 125 mph (201 km/h) when the driver saw the dangersignal, so even though he applied the emergency brake, the collision occurred at more than...
Shortly afterwards, his train passed an automatic signal showing "normal speed warning". That signified that the next signal might have a "stop" indication...
the local at a speed of 50–60 miles per hour (80–100 km/h). It had passed a colour light signalat caution and two semaphore signalsatdanger, and had...
159 159102 was approaching the junction. The SWR train failed to stop atsignal SY31, 240 yards (220 m) from Salisbury Tunnel Junction, which was displaying...
On 7 March 2015, a steam-hauled charter train passed a signalatdanger and subsequently came to a stand across a high-speed mainline junction near Wootton...
the incident determined that the Rayagada passenger train passed two defective auto signals violating norms and held its driver and the assistant driver...
difficult signal-sighting at night or driver error. After the train passed the signalatdanger, the signalman at Belicke immediately warned the next signal box...
As Jeffrey's train passed the signal, however, it was showing yellow over green. He should have stopped at the following signal, SP71, which was red...
had failed to slow down after passing two caution signals, so he was unable to stop at the dangersignal, concluding that the use of an Automatic Warning...
swing bridge into the Richelieu River after the crew failed to obey a stop signal. The widely accepted death toll is 99 people. The disaster remains the worst...
treinbeïnvloeding (ATB), which automatically overrides the driver in such a "signalpassedatdanger" situation. The junction was later rebuilt as a flying junction...
1,000 passengers left Pennsylvania Station at 6:09 p.m. Its first stop was to be Jamaica, but as it passed the Kew Gardens station, the train's engineer...
and lounge car attendant. The Conrail locomotive crew failed to stop at the signals before Gunpow Interlocking, and it was determined that the accident...
of text messaging while on duty, which led to the train passing a signalatdanger and traveling into the path of the oncoming Union Pacific freight train...
was determined to be that the driver of the express train had passed a signalatdanger. The passenger train involved was 1E79, the 10:05 service from...
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