Martin Wynne wrote:
...However, if the check rail and wheelset are not ... etc, etc, having a radius to the knuckle is helpful for traffic in the trailing direction, and potentially harmful for traffic in the facing direction.
But the worst condition of all is a sharp knuckle bend which is not exactly aligned. A radiused knuckle has a bit more leeway in positioning before the real grief begins:
Last year I bought a mint gauge at S4rum North and on checking found all 6 of my crossings to be tight in this location. My track is riveted so I made some adjustments and a did little filing and things have improved. I was concerned that I may have undone a fundamental in doing this but you have put my mind to rest. I am less concerned with the aesthetics rather than good running. But as you can see from the attached shot, a little filing is not un-prototypical (though this is probably wear). Beware though this photo was taken at the site of the Ditton Junction disaster in 1912 on the LNWR!
NB: the track was deemed not to blame for the accident