(07-10-2010, 07:00 AM)PJW Wrote:(07-10-2010, 01:00 AM)Alasdair Wrote: Someone please put me out of my misery, when the outside crossovers are reverse, which way should the middle set of points be set, for flank protection as the train doesn't actually run over them?
I know a diagram would really help explain what I'm asking...
Yes, I'd need a diagram .....
Thanks Peter.
There is a succession of single slips [137/136/138] forming a ladder (very pre 1980s layout in my opinion, although I agree that we still need such trackwork where there are length constraints that mean that a succession of separate crossovers would be too long to fit).
Also in the same string of S&C, a double slip [135/136].
So I assume that we are looking at 137.
Routes such as 473A call N as 137B is trailing and 137A gives flank.
Routes such as 471A don't call since 138A gives them flank and therefore there is no problem with 137 being used reverse or indeed used normal.
Is this what you were meaning?
PJW