I digress but this saga gets worse. The Hope Valley scheme is now bigger than just redoubling at Dore. It grew by 2013 into a plan to provide 2 extra hourly fast paths between Sheffield and Manchester.
By 2015 it was realised that couldn't happen due to congestion into both Manchester and Sheffield and the scope was reduced to only one extra fast path. Delivery is imminent and it has dawned that even one extra hourly path is problematic. Why? Partly removal of those two tracks from Dore into Sheffield.
So, just to be clear, is the current work not expected to produce any additional passenger paths to the 3 that already run? It only improves freight capacity?
Rationalisation, and single lead junctions are cheaper to maintain. Short sighted penny pinching at the time.
May I suggest that a single lead junction through a platform, with no way to bypass it even for freight is irrational?
A major consideration was the need to eliminate the once ubiquitous 1 in 8 diamond crossing. Following several incidents involving the 1-Co bogie fitted under 40s etc, 1 in 8 diamonds were deemed unsafe and had to be either changed to 1 in 7.5 diamonds, 1 in 8 switch diamonds or single lead junctions. Single lead junctions won on initial and ongoing maintenance costs.
How could they be unsafe if they were ubiquitous and no issues were encountered until the introduction of the Class 40 Diesel? Was it never considered that the Class 40 bogie design was unsafe if it was was incompatible with a common feature of the infrastructure?
Are single lead junctions not also unsafe, since they introduced for the first time a serious risk of head on collisions between trains travelling in opposite directions over the same piece of single track, when compared to the previous flank protected double junctions?
Wasn't there a modest increase in the crossover speed at Dore Station Junction when it became single lead in the 1980s?
I seem to remember that, from Sheffield, trains for Manchester used to cross over at about 30mph and it was raised 50mph (or something like that)
Yes you will be right. Less freight and one fewer passenger trains at Hazel Grove must offset that the single section is longer.
No one has mentioned the former 4 track section at the other end between Chinley and New Mills. The segregated routes were Piccadilly - Sheffield and Manchester Central - Derby with the fast lines on the north side of the formation, no problem for Hope Valley trains but other movements required crossing at ridiculously low speeds, however that is preferable to the current capacity constraints.
Surprisingly for the time the Hazel Grove chord actually increased flexibility as the only way to access Sheffield once the Woodhead Line closed was via Romiley
They had to raise the Down Buxton Line so that the chord could gain enough height in the short section to gain access to the previously freight only lines that cross the Buxton line on a bridge as well as crossing over Macclesfield Road. Its actually a very clever piece of engineering!
I have noticed the line towards Buxton goes over a hill at the bottom of the Hazel Grove chord. It may have been a clever piece of engineering for the time and it may have appeared that there was a larger programme of investment in the Hope Valley given the works at Dore and Totley, but how long were the railways expected to stay in 1980s condition exactly? Also, is it wise to have Hope Valley services consuming paths between Piccadilly and Stockport?