Crossforth
Established Member
In terms of third rail units: when a unit comes to rest without any of its pick up shoes in contact with the third rail. Most likely to happen if a unit is moving slowly over point work as there are lengthy gaps there. generally only an issue for train formations of four cars or less. Drivers know trouble spots and adjust their driving accordingly- but with only two cars can be hard.
Thanks for that. That makes sense now.