Abermule train collision

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Abermule train collision
Abermule station in 1953, looking north-east towards Welshpool. There are few changes since 1921. The station buildings are on the up platform to the left, the signal box on the down platform to the right.
Details
Date	26 January 1921 12:06
Location	Abermule, Montgomeryshire
Country	Wales
Line	Cambrian Line
Cause	Single-line token error
Statistics
Trains	2
Deaths	17
Injured	36
List of UK rail accidents by year

The Abermule train collision was a head-on collision which occurred at Abermule, Montgomeryshire, Wales on Wednesday 26 January 1921, killing 17 people.^[1][2] The crash arose from misunderstandings between staff which effectively over-rode the safe operation of the Electric Train Tablet system protecting the single line. A train departed carrying the wrong tablet for the section it was entering and collided with a train coming the other way.