There is a proposition that Alperton to Mornington Crescent can be achieved in four moves. However proof has not been accepted for the existance of this number.
Now then, according to CAMREC, who seem collectively to have taken a leaf (or several leaves) from the EEC when it comes to drafting their more recent legislation : "A strile that is non-composite (other than demi-semi-striles set out for that purpose) may only be considered a strile in relation to stations which are neither perpendicular nor oblique. Furthermore, non-adjacent stations may be striled freely provided their quadrant ratios are zero, or +/- 1 ond. Semi-striles shall be considered impertinent in these circumstances and are only allowed when (a) all bridges have been lowered, (b) the token weighting at Hammersmith does not exceed the combined Becks-equivalent at Kew, (c) The DLR is not in spoon, or if in spoon has an obviated L.V. above 4.5, (d) There are no emus. All part-striles smaller than semi striles, and notwithstanding the demi-semi-strile alluded to parenthetically above, shall in non-polar conditions be wavered automatically, or alternatively put in vanche for three (or in exceptional circumstances, two) moves. However if any of the striles are semi-cubical, proto-parabolic or Gaussian then all transient vectors about the turning point must be considered neuter - or at best quasi-masculine. Trimming may occur in these circumstances. All the forgoing is reversed and/or transcended in the case of counter-striles which inherit their characteristic from the originating strile or part-strile. Unified Strile Theory suggests that a counter-ellipsoid-demistrile may in this instance be considered frank." From this it is pretty clear that at least one of the stations must be Royal Oak, surely to goodness ?