06-10-2010, 02:08 PM
Remember the differences between traps and catch points though. They are not synonimous terms!
A basic description I've been given is that a trap is there to stop a train conflicting in the expected direction of travel. Catch points are there to stop trains running away in the incorrect direction.
Traditional catches were open as normal and the switch rail was forced against the stock rail by the train. This then sprung back to the open position when a train was absent.
Traps are also normal open but are driven reverse and back to normal again.
Jerry
A basic description I've been given is that a trap is there to stop a train conflicting in the expected direction of travel. Catch points are there to stop trains running away in the incorrect direction.
Traditional catches were open as normal and the switch rail was forced against the stock rail by the train. This then sprung back to the open position when a train was absent.
Traps are also normal open but are driven reverse and back to normal again.
Jerry
(30-09-2010, 05:42 PM)PJW Wrote:(30-09-2010, 07:45 AM)alexgoei Wrote: Dear PJW,
Based on what you are saying, RT/E/C/11004 A3 Switches & Crossings, 12 Trap Points, Wide to Gauge is really a Catch Point rather than a Trap Point?
Cheers
Alex
Indeed it is the symbol for the type of point in which rails work in anti-phase which could be used as a catch or as a trap.
It certainly does not seem applicable to the "two independent switch rail" type, but there does not seem to be an official symbol for this.
Le coureur