Overall it works pretty well and its a surprisingly quick trip . Would be a blast on the X with potentially higher speed boards though don't see that happening except with diversions . It feels strange at first not seeing too many signals and thats not such a bad thing . Speed wise its very good aside from two points . The crab across the flyover is really a bit tight and I think the designers tried too hard to reduce the gradients to a minimum and the compromise is the actual crossover point . A bit steeper and a bit better alignment could have had the speed more like 75 or 80 .
The other questionable thing is the point speeds into the loop at Leightonfield , 25 km/h at the western end is plain stupid and to look at the points are good for better . If you don't think so go take a look , it may seem like a minor thing but it will make crosses longer time wise and that has a say in the lines effective traffic capacity . This is more likely to be a yard than an infrastructure issue .