flying meet
The carefully-timed situation in which two opposing trains on a nominally single-track line meet at a siding and are able to pass each other without stopping, because they have reached the siding simultaneously.
flying meet: two trains passing at speed on a single track
A flying meet occurs when two trains travelling in opposite directions on a single-track railway line reach a passing siding at precisely the same moment, allowing both to proceed through without either stopping. The critical element is timing: both train crews must coordinate their speed and departure so that they arrive at the siding together, permitting a seamless handoff of the track. This contrasts with the normal procedure, where the first train stops in the siding to allow the second train to pass, then resumes its journey after the other train has cleared.
The tactic relies on careful signalling and train dispatch coordination. A signaller or dispatcher calculates the travel time for each train from its last reported position to the siding, then authorises both crews to proceed at line speed toward the meeting point. If calculations are sound and crews maintain their scheduled speed, the trains will arrive at opposite ends of the siding almost simultaneously. Each train enters its own section of the siding while the other occupies the adjacent section, and both can continue onward together or in quick succession depending on siding length and track geometry.
Practical limits and failure modes
Flying meets work only on sidings of sufficient length to accommodate both trains without their couplings or bodies overlapping. Most require 600 to 800 feet of usable siding, though exact requirements depend on train length. The procedure is most feasible with shorter goods trains and is rarer with long passenger trains. Failure modes include miscalculated speed, signal passed at danger, or unexpected track conditions that force one train to brake. Any deviation from the planned meeting time results in one train entering the siding while the other is still occupying it, creating a collision hazard.
The term reflects Victorian-era railway practice when signalling was less sophisticated than modern absolute block systems. On lightly-trafficked single-track railways, flying meets reduced delays by eliminating one crew's stop time. The practice persists on some heritage railways and remote freight lines where traffic density remains low and crews are highly trained. Modern computerised train control systems have made the procedure safer by automating speed and timing checks, though few railways now rely on it as a standard operating method.